. Author manuscript; available in PMC: 2017 Mar 1.

Published in final edited form as: Sleep Breath. 2016 Jan 25;20(1):293–301. doi: 10.1007/s11325-016-1313-4

Table 4.

Models evaluated for the Pittsburgh Sleep Quality Index (PSQI) and corresponding fit indices using confirmatory factor analysis among pregnant women (N=1,488)

Models	χ²	df	CFI	SRMR	RMSEA
Model 1: 2 factors (correlated), 6 components (F1: 1, 3, 5, 6; F2: 2, 4, 6)	69.967	7	0.851	0.054	0.078
Model 2: 2 factors (correlated), 6 components (F1: 1, 3, 5; F2: 2, 4, 6)	109.008	8	0.762	0.073	0.092
Model 2a: 2 factors (correlated), 6 components (F1: 1, 3, 5; F2: 2, 4, 6) correlation between e1& e5	56.633	7	0.883	0.046	0.069
Model 2b: 2 factors (correlated), 6 components (F1: 1, 3, 5; F2: 2, 4, 6) correlation between e1& e5, e2&e4	16.648	6	0.975	0.019	0.035
Model 3: 2 factors (correlated), 6 components (F1: 1, 3, 5, 6; F2: 2, 4)	136.848	8	0.696	0.091	0.104
Model 3a: 2 factors (correlated), 6 components (F1: 1, 3, 5, 6; F2: 2, 4) correlation between e1& e5	36.292	7	0.931	0.036	0.053
Model 3b: 2 factors (correlated), 6 components (F1: 1, 3, 5, 6; F2: 2, 4) correlation between e1& e5, e3&e5	16.806	6	0.975	0.026	0.035

Abbreviations: df, degree of freedom; CFI, comparative fit index;

SRMR, Standardized Root Mean Square Residual; RMSEA, root mean square error of approximation