Psychometric evaluation of the modified 19-item Bengali version of WHOQOL scale using Rasch analysis: a cross-sectional study of a rural district in Bangladesh

Uddin, Mohammed Nazim; Amirul Islam, Fakir M.

doi:10.1186/s40359-020-00411-7

Table 2 Performance of the four domains of 19-item modified WHOQOL scale using Rasch model adjustment (sample size, n = 300)

From: Psychometric evaluation of the modified 19-item Bengali version of WHOQOL scale using Rasch analysis: a cross-sectional study of a rural district in Bangladesh

	Data on Validation Process					Summary of overall model fit statistics for each domain (validation on modified instrument)
	Location	SE	Residual	χ²	P value
Overall
Overall QoL (1)	0.29	0.10	0.45	2.48	0.63
General Health (2)	−.029	0.09	0.59	2.99	0.25
Physical domain						Unidimensionality test	3.7% CI (1.2–6.1)
Pain (3)	−0.30	0.11	−1.82	8.42	0.07	Person separation index	0.873
Dependence of medical aids (4)	0.24	0.11	1.73	5.83	0.21	Cronbach’s Alpha	0.881
Energy (10)	1.02	0.10	−0.65	3.37	0.49	Chi-square (Degrees of freedom)	32.13 (20)
Mobility (15)	−1.04	0.10	−0.38	5.88	0.20	Probability value	0.0418*
Activities of daily living (17)	0.08	0.11	−0.76	8.63	0.07	Items fit residual, mean (SD)	−0.17 (1.38)
						Persons fit residual, mean (SD)	−0.42 (1.05)
Psychological domain						Unidimensionality test	4.3% CI (1.9–6.8)
Positive feeling (5)	0.18	0.10	0.48	2.52	0.64	Person separation index	0.739
Concentration (7)	0.14	0.09	−0.32	2.04	0.73	Cronbach’s Alpha	0.746
Bodily image (11)	0.40	0.10	0.57	3.23	0.52	Chi-square (Degrees of freedom)	14.93 (16)
Self-esteem (19)	−0.72	0.10	−0.39	7.15	0.13	Probability value	0.529
						Items fit residual, mean (SD)	0.08 (0.51)
						Persons fit residual, mean (SD)	−0.42 (1.01)
Social domain						Unidimensionality test	3.3% CI (0.9–5.8)
Personal relationship (20)	−0.08	0.13	−0.42	9.51	0.05	Person separation index	0.650
Sexual activity (21)	0.63	0.10	0.22	2.12	0.73	Cronbach’s Alpha	0.670
Social support (22)	0.01	0.11	0.49	0.98	0.91	Chi-square (Degrees of freedom)	12.62 (12)
						Probability value	0.397
						Items fit residual, mean (SD)	0.10 (0.46)
						Persons fit residual, mean (SD)	−0.44 (0.92)
Environmental domain						Unidimensionality test	5.0% CI (2.5–7.5)
Security (8)	0.96	0.08	−0.50	1.12	0.89	Person separation index	0.753
Physical environment (9)	−0.70	0.09	−0.43	2.98	0.56	Cronbach’s Alpha	0.781
Financial support (12)	−2.31	0.09	0.93	5.70	0.22	Chi-square (Degrees of freedom)	22.01 (20)
Accessibility of information (13)	0.37	0.10	−0.78	5.17	0.27	Probability value	0.339
Leisure activity (14)	1.68	0.10	0.78	7.03	0.13	Items fit residual, mean (SD)	−0.01 (0.79)
						Persons fit residual, mean (SD)	−0.32 (0.96)

Person separation index and Cronbach’s Alpha assess the reliability of the scale: χ² Chi-square value CI: Confidence interval, SE: Standard Error, SD: Standard deviation
Probability of Chi-square value should be higher than .05, Because the number of items of the physical domain is five, so with Bonferroni corrected p-values for the domain is (.05/5 = 0.01). Any p- value > 0.01 will be considered non-significant at 0.05 level for physical domain.

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ISSN: 2050-7283

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