Measurement of expressive vocabulary in school-age children: Development and application of the Kilifi Naming Test (KNT)

References

• Alcock, K. J., Abubakar, A., Newton, C. R. J. C., & Holding, P. (2016). The effects of prenatal HIV exposure on language functioning in Kenyan children: Establishing an evaluative framework. BMC Research Notes, 9, 463. doi:10.1186/s13104-016-2264-3
   PubMedGoogle Scholar
• Alcock, K. J., Holding, P. A., Mung’ala-Odera, V., & Newton, C. R. J. C. (2008). Constructing tests of cognitive abilities for schooled and unschooled children. Journal of Cross-Cultural Psychology, 39(5), 529–551. doi:10.1177/0022022108321176
   Web of Science ®Google Scholar
• Alcock, K. J., Rimba, K., Holding, P., Kitsao-Wekulo, P. K., Abubakar, A., & Newton, C. R. J. C. (2015). Developmental inventories using illiterate parents as informations: Communicative Developmental Inventory (CDI) adaptation for two Kenyan languages. Journal of Child Language, 42(4), 763–785. doi:10.1017/S0305000914000403
   PubMed Web of Science ®Google Scholar
• Anderson, P., Anderson, V., & Lajoie, G. (1996). The Tower of London Test: Validation and standardization for pediatric populations. The Clinical Neuropsychologist, 10(1), 54–65. doi:10.1080/13854049608406663
   Web of Science ®Google Scholar
• Anderson, P., Anderson, V., Northam, E., & Taylor, H. G. (2000). Standardization of the Contingency Naming Test (CNT) for school-aged children: A measure of reactive flexibility. Clinical Neuropsychological Assessment, 1, 247–273.
   Google Scholar
• Anderson, R. C., & Freebody, P. (1981). Vocabulary knowledge. In J. T. Guthrie (Ed.), Comprehension and teaching: Research reviews (pp. 77–116). Newark, DE: International Reading Association.
   Google Scholar
• Apiwattanalunggarn, K. L., & Luster, T. (2005). Individual differences in the school performance of 2nd-grade children born to low-income adolescent mothers: Findings from an 8-year longitudinal study. Journal of Research in Childhood Education, 19(4), 314–332. doi:10.1080/02568540509595074
   Google Scholar
• Ardila, A., & Rosselli, M. (1994). Development of language, memory, and visuospatial abilities in 5- to 12-year-old children using a neuropsychological battery. Developmental Neuropsychology, 10(2), 97–120. doi:10.1080/87565649409540571
   Web of Science ®Google Scholar
• Awiti, J. A. O. (2011). Communication rules of the Maasai and the Akamba: A comparative analysis (Doctor of Literature and Philosophy PhD). University of South Africa.
   Google Scholar
• Barker-Collo, S. L. (2001). The 60-item Boston Naming Test: Cultural bias and possible adaptations for New Zealand. Aphasiology, 15(1), 85–92. doi:10.1080/02687040042000124
   Web of Science ®Google Scholar
• Basilio, C. S., Puccini, R. F., Silva, E. M. K. d., & Pedromónico, M. r. M. (2005). Living conditions and receptive vocabulary of children aged two to five years. Rev Saude Publica, 39(5), 725–730.
   PubMed Web of Science ®Google Scholar
• Bates, E., Dale, P. S., & Thal, D. (1995). Individual differences and their implications for theories of language development. In P. Fletcher & B. MacWhinney (Eds.), Handbook of child language. pp. 96–151. Oxford, UK: Basil Blackwell.
   Google Scholar
• Beck, I. L., McKeown, M. G., & Kucan, L. (2002). Bringing words to life: Robust vocabulary instruction. New York, NY: Guilford.
   Google Scholar
• Bhargava, A., Jukes, M., Ngorosho, D., Khilma, C., & Bundy, D. A. P. (2005). Modeling the effects of health status and the educational infrastructure on the cognitive development of Tanzanian schoolchildren. American Journal of Human Biology, 17(3), 280–292. doi:10.1002/ajhb.20142
   PubMed Web of Science ®Google Scholar
• Bornstein, M. H., Hahn, C.-S., & Haynes, M. O. (2004). Specific and general language performance across early childhood: Stability and gender considerations. First Language, 24, 267–304. doi:10.1177/0142723704045681
   Google Scholar
• Bortz, M. (1997). South African Language Assessments Manual. Northumberland: STASS Publications.
   Google Scholar
• Bronfenbrenner, U. (1979). The ecology of human development: Experiments in nature and design. Cambridge, MA: Harvard University Press.
   Google Scholar
• Bronfenbrenner, U. (1995). Developmental ecology through space and time: A future perspective. In P. Moen, J. G. H. Elder, & K. Luscher (Eds.), Examining lives in context: Perspectives on the ecology of human development (pp. 619–647). Washington, DC: American Psychological Association.
   Google Scholar
• Brown, J. L., & Pollitt, E. (1996). Malnutrition, poverty and intellectual development. Scientific American, 274, 38–43. doi:10.1038/scientificamerican0296-38
   PubMed Web of Science ®Google Scholar
• Burman, D. D., Bitan, T., & Booth, J. R. (2008). Sex differences in neural processing of language among children. Neuropsychologia, 46(5), 1349–1362. doi:10.1016/j.neuropsychologia.2007.12.021
   PubMed Web of Science ®Google Scholar
• Cantalini, M. (1987). The effects of age and gender on school readiness and school success (PhD). Ontario Institute for Studies in Education, Toronto, Canada.
   Google Scholar
• Carter, J. A., Lees, J. A., Gona, J. K., Murira, G., Rimba, K., Neville, B. G. R., & Newton, C. R. J. C. (2006). Severe falciparum malaria and acquired childhood language disorder. Developmental Medicine, 48, 51–57. doi:10.1017/s0012162206000107
   Google Scholar
• Carter, J. A., Ross, A. J., Neville, B. G. R., Obiero, E., Katana, K., Mung’ala-Odera, V., … Newton, C. R. J. C. (2005). Developmental impairments following severe falciparum malaria in children. Tropical Medicine and International Health, 10(1), 3–10. doi:10.1111/j.1365-3156.2004.01345.x
   PubMed Web of Science ®Google Scholar
• Chall, J. S., Jacobs, V. A., & Baldwin, L. E. (1990). The reading crisis: Why poor children fall behind. Cambridge, MA: Harvard University Press.
   Google Scholar
• Cheung, R. W., Cheung, M.-C., & Chan, A. S. (2004). Confrontation naming in Chinese patients with left, right or bilateral brain damage. Journal of the International Neuropsychological Society, 10, 46–53. doi:10.1017/s1355617704101069
   PubMed Web of Science ®Google Scholar
• Childers, J. B., Vaughan, J., & Burquest, D. A. (2007). Joint attention and word learning in Ngas-speaking toddlers in Nigeria. Journal of Child Language, 34(2), 199–225. doi:10.1017/s0305000906007835
   PubMed Web of Science ®Google Scholar
• Christian, K., Morrison, F. J., Frazier, J. A., & Massetti, G. (2000). Specificity in the nature and timing of cognitive growth in kindergarten and first grade. Journal of Cognition and Development, 1(4), 429–448. doi:10.1207/s15327647jcd0104_04
   Web of Science ®Google Scholar
• Clacherty, G., & Kushlik, A. (2004). Meeting the challenge of research with very young children: A practical outline of methodologies used in the formative research and pre-testing of the Takalani Sesame HIV and AIDS television and radio programmes. Paper presented at the Fourth International Education Entertainment Conference, Cape Town.
   Google Scholar
• Commission on Revenue Allocation. (2013). Kenya county fact sheets. Nairobi, Kenya: Commission on Revenue Allocation.
   Google Scholar
• Connolly, K. J., & Grantham-McGregor, S. M. (1993). Key issues in generating a psychological-testing protocol. American Journal of Clinical Nutrition, 57(suppl), 317S–318S.
   PubMedGoogle Scholar
• Connolly, K. J., & Pharoah, P. O. D. (1993). Subclinical effects of iodine deficiency: Problems of assessment. In J. B. Stanbury (Ed.), The damaged brain of iodine deficiency: Cognitive, behavioral, neuomotor, educative aspects (pp. 27–36). New York, NY: Cognizant Communications.
   Google Scholar
• Connor, C. M., Morrison, F. J., & Slominski, L. (2006). Preschool instructino and children’s emergent literacy skill growth. Journal of Educational Psychology, 98, 665–689. doi:10.1037/0022-0663.98.4.665
   Web of Science ®Google Scholar
• Court, J. H., & Raven, J. (1995). Manual for Raven’s Progressive Matrices and Vocabulary Scales. Section 7: Research and references: Summaries of normative, reliability, and validity studies and references to all sections. Oxford, England/San Antonio, TX: Oxford Psychologists Press/The Psychological Corporation.
   Google Scholar
• Cunningham, A. E., & Stanovich, K. E. (1998). What reading does for the mind. American Educator, 22(1-2), 8–15.
   Google Scholar
• Delis, D. C., Kramer, J. H., Kaplan, E., & Ober, B. A. (1989). California Verbal Learning Test - Children’s Version. San Antonio, TX: Harcourt Brace.
   Google Scholar
• Demuth, K. (1990). Subject, topic and Sesotho passive. Journal of Child Language, 17, 67–84. doi:10.1017/s0305000900013106
   PubMed Web of Science ®Google Scholar
• Dickinson, D. K., & Tabors, P. O. (Eds.). (2001). Beginning literacy with language: Young children learning at home and school. Baltimore, MD: Paul H. Brookes.
   Google Scholar
• Dollagan, C. A. (2007). The handbook for evidence-based practice in communication disorders. Baltimore, MD: Paul H. Brookes.
   Google Scholar
• Dupéré, V., Leventhal, T., Crosnoe, R., & Dion, É. (2010). Understanding the positive role of neighborhood socioeconomic advantage in achievement: The contribution of the home, child care and school environments. Developmental Psychology, 46(5), 1227–1244. doi:10.1037/a0020211
   PubMed Web of Science ®Google Scholar
• Eriksson, M., Marschik, P. B., Tulviste, T., Almgren, M., Pereira, M. P., Wehberg, S., … Gallego, C. (2012). Differences between girls and boys in emerging language skills: Evidence from 10 language communities. British Journal of Developmental Psychology, 30, 326–343. doi:10.1111/j.2044-835X.2011.02042.x
   PubMed Web of Science ®Google Scholar
• Evans, G. W., Maxwell, L. E., & Hart, B. (1999). Parental language and verbal responsiveness to children in crowded homes. Developmental Psychology, 35, 1020–1023. doi:10.1037//0012-1649.35.4.1020
   PubMed Web of Science ®Google Scholar
• Fernald, L. C. H., Weber, A., Galasso, E., & Ratsifandrihamanana, L. (2011). Socioeconomic gradients and child development in a very low income population: Evidence from Madagascar. Developmental Science, 14(4), 832–847. doi:10.1111/j.1467-7687.2010.01032.x
   PubMed Web of Science ®Google Scholar
• Fletcher, J. M. (1985). Memory for verbal and nonverbal stimuli in learning disability subgroups: Analysis by selective reminding. Journal of Experimental Child Psychology, 40, 244–259. doi:10.1016/0022-0965(85)90088-8
   PubMed Web of Science ®Google Scholar
• George, D., & Mallery, P. (2003). SPSS for Windows step by step: A simple guide and reference. 11.0 update (4th ed.). Boston, MA: Allyn & Bacon.
   Google Scholar
• Grantham-McGregor, S., Cheung, Y. B., Cueto, S., Glewwe, P., Richter, L., Strupp, B., & International Child Development Steering Group. (2007). Developmental potential in the first 5 years for children in developing countries. The Lancet, 369, 60–70. doi:10.1016/s0140-6736(07)60032-4
   PubMed Web of Science ®Google Scholar
• Greenfield, P. M. (2009). Linking social change and developmental change: shifting pathways of human development. Developmental Psychology, 45(2), 401–418. doi:10.1037/a0014726
   PubMed Web of Science ®Google Scholar
• Hall, R., Greenberg, D., Gore, J. L., & Pae, H. K. (2014). The relationship between expressive vocabulary knowledge and reading skills for adult struggling readers. Journal of Research in Reading, 37(Suppl 1), 87–100. doi:10.1111/j.1467-9817.2012.01537.x
   PubMed Web of Science ®Google Scholar
• Halperin, J. M., Healey, J. M., Zeitchik, E., Ludman, W. L., & Weinstein, L. (1989). Developmental aspects of linguistic and mnestic abilities in normal children. Journal of Clinical and Experimental Neuropsychology, 11(4), 518–528. doi:10.1080/01688638908400910
   PubMed Web of Science ®Google Scholar
• Hamadani, J. D., Baker-Henningham, H., Tofail, F., Mehrin, F., Huda, S. N., & Grantham-McGregor, S. M. (2010). Validity and reliability of mothers’ reports of language development in 1-year-old children in a large-scale survey in Bangladesh. Food and Nutrition Bulletin, 31(2 (supplement)), S198–S206. doi:10.1177/15648265100312s212
   PubMed Web of Science ®Google Scholar
• Hart, B., & Risley, T. (1995). Meaningful differences in the everyday experience of young American children. Baltimore: Paul H. Brookes.
   Google Scholar
• Hawkins, K. A., Sledge, W. H., Orleans, J. F., Quinlan, D. M., & Huffman, R. E. (1993). Normative implications of the relationship between reading vocabulary and Boston naming test performance. Archives of Clinical Neuropsychology, 8(6), 525–537. doi:10.1093/arclin/8.6.525
   PubMed Web of Science ®Google Scholar
• Hayes, D. P., & Ahrens, M. (1988). Vocabulary simplification for children: A special case of “motherese.” Journal of Child Language, 15, 395–410. doi:10.1017/s0305000900012411
   PubMed Web of Science ®Google Scholar
• Hoff, E. (2003). The specificity of environmental influence: Socioeconomic status affects early vocabulary development via maternal speech. Child Development, 74(5), 1368–1378. doi:10.1111/1467-8624.00612
   PubMed Web of Science ®Google Scholar
• Hoff, E., Laursen, B., & Tardif, T. (2002). Socioeconomic status and parenting. In M. H. Bornstein (Ed.), Handbook of parenting (2nd ed., pp. 231–252). Mahwah, NJ: Erlbaum.
   Google Scholar
• Hoff-Ginsberg, E. (1991). Mother-child conversation in different social classes and communicative settings. Child Development, 62(4), 782–796. doi:10.1111/j.1467-8624.1991.tb01569.x
   PubMed Web of Science ®Google Scholar
• Hoffman, L. M., Loeb, D. F., Brandel, J., & Gillam, R. B. (2011). Concurrent and construct validity of oral language measures with school age children with specific language impairment. Journal of Speech, Language and Hearing Research, 54(6), 1597–1608. doi:10.1044/1092-4388(2011/10-0213)
   PubMed Web of Science ®Google Scholar
• Holding, P. A., Abubakar, A., & Kitsao-Wekulo, P. (2009). Where there are no tests: A systematic approach to test adaptation. In M. L. Landow (Ed.), Cognitive impairment: Causes, diagnosis and treatments (pp. 189–200). New York, NY: Nova Science.
   Google Scholar
• Holding, P. A., Taylor, H. G., Kazungu, S. D., Mkala, T., Gona, J., Mwamuye, B., … Stevenson, J. (2004). Assessing cognitive outcomes in a rural African population: Development of a neuropsychological battery in Kilifi District, Kenya. Journal of the International Neuropsychological Society, 10, 246–260. doi:10.1017/s1355617704102166
   PubMed Web of Science ®Google Scholar
• Huttenlocher, J., Vasilyeva, M., Cymerman, E., & Levine, S. (2002). Language input and child syntax. Cognitive Psychology, 45, 337–374. doi:10.1016/s0010-0285(02)00500-5
   PubMed Web of Science ®Google Scholar
• Hyde, J. S., & Linn, M. C. (1988). Gender differences in verbal ability: A meta-analysis. Psychological Bulletin, 104(1), 53–69. doi:10.1037//0033-2909.104.1.53
   Web of Science ®Google Scholar
• Jordan, F. M., & Ashton, R. (1996). Language performance of severely closed head injured children. Brain Injury, 10(2), 91–97. doi:10.1080/026990596124575
   PubMed Web of Science ®Google Scholar
• Kahuthu, R., Muchoki, T., & Nyaga, C. (2005). Kilifi District Strategic Plan 2005–2010 for implementation of the national population policy for sustainable development. Nairobi, Kenya: National Coordination Agency for Population and Development.
   Google Scholar
• Kanjilal, B., Mazumdar, P. G., Mukherjee, M., & Rahman, M. H. (2010). Nutritional status of children in India: household socio-economic condition as the contextual determinant. International Journal for Equity in Health, 9, 19–31. doi:10.1186/1475-9276-9-19
   PubMed Web of Science ®Google Scholar
• Kaplan, E., Goodglass, H., & Weintraub, S. (1983). The Boston Naming Test. Philadelphia, PA: Lea and Febiger.
   Google Scholar
• Kim, H., & Na, D. L. (2008). A normative study of the Boston Naming Test in 3- to 14-year-old Korean children. The Clinical Neuropsychologist, 22(1), 84–97. doi:10.1080/13854040601064526
   PubMed Web of Science ®Google Scholar
• Kitsao-Wekulo, P. K., Holding, P. A., Taylor, H. G., Abubakar, A., & Connolly, K. (2013). Neuropsychological testing in a rural African school-age population: Evaluating contributions to variability in test performance. Assessment, 20(6), 776–784. doi:10.1177/1073191112457408
   PubMed Web of Science ®Google Scholar
• Kornilova, S. A., Lebedeva, T. V., Zhukova, M. A., Prikhoda, N. A., Korotaeva, I. V., Koposov, R. A., … Grigorenko, E. L. (2017). Language development in rural and urban Russian-speaking children with and without developmental language disorder. Learning and Individual Differences, 46, 45–53. doi:10.1016/j.lindif.2015.07.001
   Web of Science ®Google Scholar
• Leaper, C. (2002). Parenting girls and boys. In M. H. Bornstein (Ed.), Handbook of parenting: Vol. 1. Children and parenting (2nd ed., Vol. 1, pp. 127–152). Mahwah, NJ: Erlbaum.
   Google Scholar
• Leventhal, T., & Brooks-Gunn, J. (2000). The neighborhoods they live in: The effects of neighborhood residence upon child and adolescent outcomes. Psychological Bulletin, 126, 309–337. doi:10.1037//0033-2909.126.2.309
   PubMed Web of Science ®Google Scholar
• Levine, S. C., Huttenlocher, J., Taylor, A., & Langrock, A. (1999). Early sex differences in spatial skills. Developmental Psychology, 35, 940–949. doi:10.1037/0012-1649.35.4.940
   PubMed Web of Science ®Google Scholar
• Luo, S., & Zhang, X. (2011). Multiple-choice item and its backwash effect on language teaching in China. Theory and Practice in Language Studies, 1(4), 423–425. doi:10.4304/tpls.1.4.423-425
   Google Scholar
• Luoni, C., Balottin, U., Rosana, L., Savelli, E., Salini, S., & Termine, C. (2015). Confrontation naming and reading abilities at primary school: A longitudinal study. Behavioural Neurology, 2015, 10. doi:10.1155/2015/981548
   Web of Science ®Google Scholar
• Maccoby, E. (1980). Social Development. New York, NY: Harcourt Brace Jovanovich.
   Google Scholar
• Malvern, D. D., & Richards, B. J. (1997). A new measure of lexical diversity. In A. Ryan, & A. Wray (Eds.), Evolving models of language. pp. 58–71. Bristol, UK: Multilingual Matters.
   Google Scholar
• Manly, T., Robertson, I. H., Anderson, V., & Nimmo-Smith, I. (1999). TEA-Ch: The test of Everyday Attention for Children. Bury St Edmunds, England: Thames Valley Test Company.
   Google Scholar
• Massaro, D. W., & Perlman, M. (2017). Quantifying iconicity’s contribution during language acquisition: Implications for vocabulary learning. Frontiers in Communication, 2(4). doi:10.3389/fcomm.2017.00004
   PubMedGoogle Scholar
• Mbise, A. S., & Kysela, G. M. (1990). Developing appropriate screening and assessment instruments: The case of Tanzania. In M. J. Thorburn, & K. Marfo (Eds.), Practical approaches to childhood disability in developing countries: Insights from experience and research. Tampa, FL: Global Age. doi:
   Google Scholar
• Miller, G. A., & Gildea, P. M. (1987). How children learn words. Scientific American, 257, 94–99. doi:10.1038/scientificamerican0987-94
   PubMed Web of Science ®Google Scholar
• Mills, M. T. (2015). The effects of visual stimuli on the spoken narrative performance of school-age African American children. Language, Speech, and Hearing Services in Schools, 46, 337–351. doi:10.1044/2015_lshss-14-0070
   PubMed Web of Science ®Google Scholar
• Miotto, E. C., Sato, J., Lucia, M. C. S., Camargo, C. H. P., & Scaff, M. (2010). Development of an adapted version of the Boston Naming Test for Portuguese speakers. Revista Brasileira de Psiquiatria, 32(3), 279–282. doi:10.1590/s1516-44462010005000006
   PubMed Web of Science ®Google Scholar
• Nampijja, M., Apule, B., Lule, S., Akurut, H., Muhangi, L., Elliot, A. M., & Alcock, K. J. (2010). Adaptation of Western measures of cognition for assessing 5-year-old semi-urban Ugandan children. British Journal of Educational Psychology, 80(1), 15–30. doi:10.1348/000709909x460600
   PubMed Web of Science ®Google Scholar
• Nation, K., & Snowling, M. (2004). Beyond phonological skills: Broader language skills contribute to the development of reading. Journal of Research in Reading, 27(4), 342–356. doi:10.1111/j.1467-9817.2004.00238.x
   Web of Science ®Google Scholar
• Newcomer, P. L., & Hammill, D. D. (1997). Test of Language Development-Primary (3rd ed.). Austin, TX: Pro-Ed Inc.
   Google Scholar
• Noble, K. G., McCandliss, B. D., & Farah, M. J. (2007). Socioeconomic gradients predict individual differences in neurocognitive abilities. Developmental Science, 10(4), 464–480. doi:10.1111/j.1467-7687.2007.00600.x
   PubMed Web of Science ®Google Scholar
• Nyasani, J. M. (1997). The African psyche. Nairobi, Kenya: University of Nairobi Theological Printing Press.
   Google Scholar
• Pakendorf, C., & Alant, E. (1997). Culturally valid assessment tools: Northern Sotho translation of the Peabody Picture Vocabulary Test - Revised. South African Journal of Communication Disorders, 44, 3–12.
   PubMedGoogle Scholar
• Petrides, M., & Milner, B. (1982). Deficits on subject-ordered tasks after frontal- and temporal-lobe lesions in man. Neuropsychologia, 20(3), 249–262. doi:10.1016/0028-3932(82)90100-2
   PubMed Web of Science ®Google Scholar
• Raven, J. C., Court, J. H., & Raven, J. (1998). Manual for Raven’s progressive matrices and vocabulary scales: Section 2 - The colored progressive matrices. San Antonio, TX: Psychological Corporation.
   Google Scholar
• Ricketts, J., Nation, K., & Bishop, D. V. M. (2007). Vocabulary is important for some, but not all reading skills. Scientific Studies of Reading, 11(3), 235–257. doi:10.1080/10888430701344306
   Web of Science ®Google Scholar
• Sampson, R. J., Morenoff, J. D., & Gannon-Rowley, T. (2002). Assessing “neighborhood effects”: Social processes and new directions in research. Annual Review of Sociology, 28, 443–478. doi:10.1146/annurev.soc.28.110601.141114
   Web of Science ®Google Scholar
• Schady, N., Behrman, J., Araujo, M. C., Azuero, R., Bernal, R., Bravo, D., … Vakis, R. (2015). Wealth gradients in early childhood cognitive development in five Latin American countries. Journal of Human Resources, 50(2), 446–463. doi:10.3368/jhr.50.2.446
   PubMed Web of Science ®Google Scholar
• Sénéchal, M., Ouellette, G., & Rodney, D. (2006). The misunderstood giant: On the predictive role of vocabulary to reading In S. B. Neuman, & D. Dickinson (Eds.), Handbook of early literacy (pp. 173–182). New York, NY: Guilford Press.
   Google Scholar
• Sigman, M., McDonald, M. A., Neumann, C., & Bwibo, N. (1991). Prediction of cognitive competence in Kenyan children from toddler nutrition, family characteristcis and abilities. Journal of Child Psychology and Psychiatry, 32, 307–320. doi:10.1111/j.1469-7610.1991.tb00309.x
   PubMed Web of Science ®Google Scholar
• Sigman, M., Neumann, C., Carter, E., Cattle, D. J., D’Souza, S., & Bwibo, N. (1989). Home interactions and the development of Embu toddlers in Kenya. Child Development, 59, 1251–1261. doi:10.2307/1130488
   Web of Science ®Google Scholar
• Sigman, M., Neumann, C., Jansen, A. A. J., & Bwibo, N. (1989). Cognitive abilities of Kenyan children in relation to nutrition, family characteristics, and education. Child Development, 60(6), 1463–1474. doi:10.2307/1130935
   PubMed Web of Science ®Google Scholar
• Sinha, D., & Misra, R. C. (1982). Some socio-environmental disadvantages and skill for perception of pictorial symbols. Journal of Personality Study and Group Behaviour, 2, 111–121. doi:10.1177/002202217400500405
   Web of Science ®Google Scholar
• Skibbe, L. E., Connor, C. M., Morrison, F. J., & Jewkes, A. M. (2011). Schooling effects on preschoolers’ self-regulation, early literacy, and language growth. Early Childhood Research Quarterly, 26, 42–49. doi:10.1016/j.ecresq.2010.05.001
   PubMed Web of Science ®Google Scholar
• Storms, G., Saerens, J., & Deyn, P. P. D. (2004). Normative data for the Boston Naming Test in native Dutch-speaking Belgian chldren and the relation with intelligence. Brain and Language, 91(3), 274–281. doi:10.1016/j.bandl.2004.03.005
   PubMed Web of Science ®Google Scholar
• Strauss, E., Sherman, E. M. S., & Spreen, O. (2006). A compendium of neuropsychological tests: Administration, norms, and commentary (3rd ed.). New York, NY: Oxford University Press.
   Google Scholar
• Suzman, S. M. (1987). Passives and prototypes in Zulu children’s speech. African Studies, 46(2), 241–254. doi:10.1080/00020188708707677
   Web of Science ®Google Scholar
• Tatsuta, N., Nakai, K., Suzuki, K., Kurokawa, N., Hosokawa, T., & Satoh, H. (2013). Normative study of the Boston Naming Test in 7-year-old Japanese children. Japanese Journal of Hygiene, 68(3), 189–196. doi:10.1265/jjh.68.189
   PubMedGoogle Scholar
• UNESCO Institute for Statistics. (2011). Education (all levels) profile - Kenya. UIS Statistics in brief . Retrieved from http://stats.uis.unesco.org/unesco/TableViewer/document.aspx?ReportId=289&IF_Language=eng&BR_Country=4040&BR_Region=40540
   Google Scholar
• van de Vijver, F., & Tanzer, N. K. (2004). Bias and equivalence in cross-cultural assessment: an overview. European Review of Applied Psychology, 54, 119–135. doi:10.1016/j.erap.2003.12.004
   Google Scholar
• Vogt, P., Douglas, J. M., & Aussems, S. (2015). Early vocabulary development in rural and urban Mozambique. Child Development Research, 2015, 15. doi:10.1155/2015/189195
   Google Scholar
• Wachs, T. D. (1995). Relation of mild-to-moderate malnutrition to human development: Correlational studies. The Journal of Nutrition, 125(8), 2245–2254.
   PubMed Web of Science ®Google Scholar
• Wachs, T. D., Bishry, Z., Moussa, W., Yunis, F., McCabe, G., Harrison, G., … Shaheen, F. (1995). Nutritional intake and context as predictors of cognition and adaptive behaviour of Egyptian school-age children. International Journal of Behavioural Development, 18(3), 425–450. doi:10.1177/016502549501800303
   Web of Science ®Google Scholar
• Weizman, Z. O., & Snow, C. E. (2001). Lexical input as related to children’s vocabulary acquisition: Effects of sophisticated exposure and support for meaning. Developmental Psychology, 37(2), 265–279. doi:10.1037//0012-1649.37.2.265
   PubMed Web of Science ®Google Scholar
• Wenger, M. (1989). Work, play and social relationships among children in a Giriama community. In D. Belle (Ed.), Children’s social networks and social supports (pp. 91–115). New York, NY: Wiley.
   Google Scholar
• Whaley, S. E., Sigman, M., Beckwith, L., Cohen, S. E., & Espinosa, M. P. (2002). Infant-caregiver interaction in Kenya and the United States: The importance of multiple caregivers and adequate comparison samples. Journal of Cross-Cultural Psychology, 33(3), 236–247. doi:10.1177/0022022102033003002
   Web of Science ®Google Scholar
• World Health Organization. (2007). Growth reference data for 5–19 years. Geneva, Switzerland: WHO.
   Google Scholar