Does the 12-item General Health Questionnaire contain multiple factors and do we need them?

Table 2 Goodness-of-fit of six confirmatory factor analysis models (N = 120) ^(a),(b)

Statistics	Model I (1 factor)	Model IIA (2 factors)	Model IIB (2 factors)	Model IIIA (3 factors)	Model IIIB (3 factors)	Model IIIC (3 factors)
AIC	69.529	29.220	29.956	51.611	21.075	48.956
CFI	0.888	0.927	0.925	0.908	0.935	0.910
RMSEA	0.139	0.115	0.115	0.130	0.109	0.128

(a) AIC: Akaike's Information Criterion; CFI: Comparative Fit Index; RMSEA: Root Mean-Square Error of Approximation
(b) See text for details about the models.

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