Table 3.

Fit indices for the PHQ‐9 from confirmatory factor analyses by age

	N	R‐χ 2	SRMR	R‐RMSEA	R‐CFI	ΔR‐CFI
Age group
11‐12	1207	82.49	0.030	0.045	0.944	‐
13	1615	122.30	0.032	0.050	0.962	‐
14	1789	123.49	0.060	0.048	0.964	‐
15	2036	108.48	0.026	0.042	0.975	‐
16	2338	145.20	0.028	0.046	0.972	‐
17	1948	219.32	0.036	0.065	0.948	‐
Invariance test
Configural	144	789.94	0.031	0.050	0.963	‐
Metric	184	858.66	0.039	0.045	0.962	−0.000
Scalar	229	1403.31	0.045	0.047	0.963	−0.001
Strict	279	1498.53	0.054	0.049	0.961	0.002
Strict + Error covariances	294	1493.40	0.053	0.042	0.962	−0.001

Abbreviations: CFI, comparative fit index; PHQ‐9, nine‐item Patient Health Questionnaire; R‐CFI, robust CFI; R‐RMSEA, robust root mean square error approximation; SRMR, standardized root mean square residual.