Development and validation of a self-management self-efficacy scale for premature birth prevention (SMSE-PBP) for women of childbearing age

Table 2 Fit indices of the first- and second-order confirmatory factor models of the SMSE-PBP (N = 349)

Model	χ²	df	P value	NC	CFI	TLI	RMSEA (90% CI)	SRMR	AIC
Dimension 1: the first	274.36	62	< 0.001	4.23	0.90	0.88	0.10 (0.09–0.11)	0.06	9704.07
Dimension 1: the final	158.15	59	< 0.001	2.68	0.96	0.94	0.07 (0.06–0.08)	0.05	9593.85
Dimension 2: the first	1359.48	454	< 0.001	3.07	0.88	0.87	0.08 (0.07–0.08)	0.07	22911.21
Dimension 2: the final	1118.79	449	< 0.001	2.49	0.92	0.91	0.07 (0.06–0.07)	0.06	22644.52
Dimension 3: the first	466.90	103	< 0.001	4.53	0.93	0.92	0.101 (0.09–0.11)	0.04	9313.41
Dimension 3: the final	265.95	86	< 0.001	3.09	0.96	0.95	0.08 (0.07–0.09)	0.03	8601.78
First order SMSE-PBP	3449.31	1654	< 0.001	2.09	0.89	0.89	0.06 (0.05–0.06)	0.06	39844.86
Second-order SMSE-PBP: the first	3676.82	1686	< 0.001	2.18	0.88	0.88	0.06 (0.06–0.06)	0.07	40008.36
Second-order SMSE-PBP: the final	3492.11	1684	< 0.001	2.07	0.89	0.89	0.06 (0.05-0.06)	0.06	39827.65

Abbreviations SMSE-PBP, Self-Management Self-Efficacy Scale for Premature Birth Prevention; df, degree-of-freedom; NC, normed chi-square; CFI, Comparative Fit Index; TLI, Tucker-Lewis Index; RMSEA, Root Mean Square Error of Approximation; SRMR, Standardized Root Mean Residual; AIC, Akaike Information Criterion
Dimension 1, Pre-pregnancy SMSE-PBP; Dimension 2, Pregnancy SMSE-PBP; Dimension 3, Hospital SMSE-PBP
Fit indices: NC (< 3 good, < 5 acceptable), CFI, TLI (> 0.9), RMSEA, SRMR (< 0.08), AIC (the lowest)

ISSN: 1472-6874