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Table 5 Longitudinal measurement invariance model fit statistics for the K6

From: Factor structure and longitudinal measurement invariance of the K6 among a national representative elder sample of China

Model

χ 2

df

CFI

TLI

RMSEA(90%CI)

Δχ 2(Δdf)

ΔCFI

ΔTLI

ΔRMSEA

Configural

267.712

42

0.995

0.992

0.037

(0.033, 0.042)

    

Strong

318.685

62

0.994

0.994

0.033

(0.029, 0.036)

65.352(20)

-0.001

0.002

-0.004

Strict

371.122

68

0.993

0.994

0.034

(0.031, 0.037)

55.475(6)

-0.001

0

0.001

  1. N = 3845. χ2, chi-square goodness of fit statistic; df, degrees of freedom; CFI Comparative fit index, TLI Tucker lewis index, RMSEA Root-mean-square error of approximation; Δχ 2(Δdf), difference testing based on the DIFFTEST procedure for nested models with WLSMV; ΔCFI, change in Comparative Fit Index relative to the preceding model; ΔTLI, change in Tucker-Lewis Index relative to the preceding model; ΔRMSEA, change in Root-Mean-Square Error of Approximation relative to the preceding model