Validation and Cultural Adaptation of the Sinhala Translation of the Cardiff Acne Disability Index (CADI)

Figures & data

Table 1 Sociodemographic Characteristics of the Study Population

	Number/Mean (SD) (n= 150)	Percentage
Age (years)
< 20	07	4.7
21–25	123	82.0
≥ 26	20	13.3
Mean age (SD)	23 (2.5)
Sex
Male	17	11.3
Female	133	88.7
Ethnicity
Sinhala	145	96.7
Muslim	05	3.3
Religion
Buddhism	139	92.7
Others	11	7.3
Marital status
Married	04	2.7
Others	146	97.3
Education
Up to advanced level	35	23.3
Diploma/Vocational Training	5	3.3
Degree	108	72.0
Postgraduate qualification	2	1.3
Employment
Unemployed	53	35.3
Employed	97	64.7
Income
Less than Rs. 10,000 (US$ 30)	135	90
Rs.10,000–25,000 (US$ 30–76)	2	1.3
Rs. 25,001–50,000 (US$ 76–152)	5	3.3
Rs. 50,001–75,000 (US$ 152–227)	2	1.3
Rs. 75,001–100,000 (US$ 227–303)	5	3.3
> Rs 100,000 (≥ US$ 303)	1	0.7
Acne severity by GAGS
Mild	106	70.6
Moderate	40	26.7
Severe	4	2.7

Table 2 Comparison of CADI Grading with DLQI and GAGS Severity

	CADI				χ2; df; p value
	No Impairment (n=19) (%)	Mild Impairment (n=100) (%)	Moderate Impairment (n=27)(%)	Severe Impairment (n=4) (%)
DLQI
No effect at all	18 (94.7)	33 (33.0)	0 (0.0)	0 (0.0)	117.6; 9; 0.001
Small effect	0 (0.0)	47 (47.0)	7 (25.9)	0 (0.0)
Moderate effect	1 (5.3)	18 (18)	15 (55.6)	0 (0.0)
Very large effect	0 (0.0)	2 (2.0)	5 (18.5)	4 (100.0)
Extremely large impact	0 (0.0)	0 (0.0)	0 (0.0)	0 (0.0)
GAGS severity
Mild	18 (94.7)	74 (74.0)	14 (51.9)	0 (0.0)	26.1; 6; 0.001
Moderate	01 (5.3)	25 (25.0)	11 (40.7)	3 (75.0)
Severe	0 (0.0)	1 (1.0)	2 (7.4)	1 (25.0)

Figure 1 Comparison of the means of CADI and DLQI scores with the GAGS severity.

Table 3 Spearman’s Rho Correlation Between GAGS and DLQI with CADI

	GAGS (p)	DLQI (p)
CADI Total score	0.331 (0.001)	0.696 (0.001)
CADI Q1	0.303 (0.001)	0.604 (0.001)
CADI Q2	0.325 (0.001)	0.532 (0.001)
CADI Q3	0.030 (0.001)	0.299 (0.001)
CADI Q4	0.142 (0.001)	0.509 (0.001)
CADI Q5	0.375 (0.001)	0.589 (0.001)

Figure 2 Concurrent validity between CADI Sinhala and DLQI Sinhala by Pearson correlation (r = 0.696; p <0.001).

Table 4 Rotated Factor Loads of the Items of CADI

CADI Items	Factor 1
CADI Q1	0.874
CADI Q2	0.854
CADI Q3	0.421
CADI Q4	0.761
CADI Q5	0.819
% of variance / % cumulative	58.4%

Table 5 Cronbach’s Alpha of CADI Sinhala and Its Correlations After Removal of CADI Q3

	Inter-Item Correlation				Corrected Item Total Correlation	Cronbach’s Alpha if CADI Q3 Deleted
	CADI Q1	CADI Q2	CADI Q3	CADI Q4
CADI Q1	-	-	-	-	0.762	0.734
CADI Q2	0.689	-	-	-	0.727	0.747
CADI Q3	0.260	0.350	-	-	0.290	0.854
CADI Q4	0.588	0.497	0.202	-	0.612	0.787
CADI Q5	0.649	0.625	0.156	0.533	0.685	0.761