References
- Skobelhoff E, Spivey W, St Clair S, Schoffstall J. The influence of age and sex on asthma admissions. JAMA 1992; 268: 3437–3440
- Mao Y, Semenciw R, Morrison H, MacWilliam L, Davies J, Wigle D. Increased rates of illness and death from asthma in Canada. Can Med Assoc J 1987; 137: 620–624
- Infante-Rivard C, Sukia Esnaola S, Roberge D, Baumgarten M. The changing frequency of childhood asthma. J Asthma 1987; 137: 620
- Wilkins K, Mao Y. Trends in rates of admission to hospital and death from asthma among children and young adults in Canada during the 1980′s. Can Med Assoc J 1993; 148: 185–190
- Manfreda J, Becker A B, Wang P, Roos L L, Anthonisen N R. Trends in physician-diagnosed asthma prevalence in Manitoba between 1980 and 1990. Chest 1993; 103: 151–157
- Weiss K, Wagner D. Asthma surveillance in the United States: A review of current trends and knowledge gaps. Chest 1990; 98: 179S–184S
- Gergen P, Weiss K. Changing patterns of asthma hospitalization among children: 1979 to 1987. JAMA 1990; 264: 1688–1692
- Burney P. Asthma mortality in England and Wales: Evidence of a further increase, 1974–84. Lancet 1986; 2: 323–326
- Sears M, Rea H, Beaglehole R, Gillies A, Holst P, O'Donnell T, et al. Asthma mortality in New Zealand: A two-year national study. NZ Med J 1985; 98: 271–275
- Bousquet J, Hatton F, Godard P, Michel F P. Asthma mortality in France. J Allergy Clin Immunol 1987; 80(pt 2)389–394
- Johansen H, Dutta M, Mao Y, Chagani K, Sladecek I. An investigation of the increase in pre-school age asthma in Manitoba, Canada. Health Rep 1992; 4: 379–102
- International Classification of Diseases9th rev. WHO, Geneva 1978
- SAS Institute Inc. SAS Language Guide for Personal Computers6 Edition. SAS Institute Inc, Cary, NC 1985; 429, Version
- SAS Institute Inc. SAS Procedures Guide for Personal Computers, Version6 Edition. SAS Institute Inc, Cary, NC 1985; 373
- Gergen P, Mullally D R, Evans R, III. National survey of prevalence of asthma among children in the United States, 1976 to 1980. Pediatrics 1988; 81: 1–7
- Anderson H, Bland J, Patel S, et al. The natural history of asthma in childhood. J Epidemiol Community Health 1986; 40: 121–129
- Mak H, Johnston P, Abbey H, et al. Prevalence of asthma and health service utilization of asthmatic children in an inner city. J Allergy Clin Immunol 1982; 70: 367–372
- Sears M, Jones D, Silva P, et al. Asthma in seven year old children: A report from the Dunedin Multidisciplinary Child Development Study. NZ Med J 1982; 95: 53–536
- Lebowitz M. The relationship of socio-environmental factors to the prevalence of obstructive lung problems and other chronic conditions. J Chronic Dis 1977; 30: 599–611
- Tepper R, Morgan W, Cota K, et al. Physiological growth and development of the lung during the first year of life. Am Rev Respir Dis 1986; 134: 513–519
- Svenson L, Woodhead S, Platt G. Estimating the prevalence of asthma in Alberta: A study using provincial health care records. Chronic Dis Can 1993; 14(2)28–33
- Martinez F, Morgan W, Wright A, Holberg C, Taussig L. Diminished lung function as a predisposing factor for wheezing respiratory illnesses in infants. N Engl J Med 1988; 319: 1112–1117
- Taussig L, Smith S, Blumfeld R. Chronic bronchitis in childhood: What is it?. Paediatrics 1981; 67: 1–5
- Speight A, Lee D, Hey E. Underdiagnosis and undertreatment of asthma in childhood. Br Med J 1983; 286: 1253–1256
- Mitchell E A, Bland J M, Thompson J MD. Risk factors for readmission to hospital for asthma in childhood. Thorax 1994; 49: 33–36
- Osborne M, Volmer W, Buist S. Diagnostic accuracy of asthma within a health maintenance organization. J Clin Epidemiol 1992; 45: 403
- Roos L, Nichol P, Cageorge S. Using administrative data for longitudinal research: Comparison with primary data collection. J Chronic Dis 1987; 40: 41–49