Factorial validity and internal consistency of the PRAFAB questionnaire in women with stress urinary incontinence

BMC Urology

Table 4 Results of exploratory factor analyses in Sample A followed by confirmatory factor analyses in Sample B with final factor loadings of the forced premeditated two-factor model of the PRAFAB questionnaire after promax (oblique) rotation using principal component analyses ('simple structure' replication analysis) and maximum likelihood analysis

	Exploratory Factor Analysis		Confirmatory Factor Analysis
	Sample A (N = 140)		Sample B (N = 139)
			Simple structure		Maximum Likelihood ^d
	Factor 1	Factor 2	Factor 1	Factor 2	Factor 1	Factor 2
Protection	0.85	0.06	0.81	0.23	0.71	0.21
Amount	0.83	0.23	0.76	0.14	0.57	0.13
Frequency	0.66	0.40	0.73	0.37	0.58	0.31
Adjustment	0.08	0.79	0.25	0.78	0.28	0.40
Body (or self) image	0.35	0.77	0.24	0.84	0.26	0.93
Eigenvalue before rotation ^a	2.14	1.05	2.06	1.04	1.25	1.09
Explained variance (%) ^b	42.8%	21.2%	41.2%	20.8%	25.1%	21.8%
Eigenvalue after rotation ^a,c	1.99	1.48	1.87	1.53	1.19	1.31

^a Factor loadings ≥ 0.40 are in bold.
^b Percentage of explained variance per factor before and after oblique rotation is the same in PCA.
^c Because factors are correlated the rotation sum-of-squared loadings cannot be interpreted in terms of proportion of variance or added to obtain a total variance.
^d Chi-square goodness-of-fit test: chi-square 1.314; df = 1; p = 0.25

ISSN: 1471-2490