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. Author manuscript; available in PMC: 2013 Jun 1.
Published in final edited form as: Sleep Med. 2012 Apr 28;13(6):752–758. doi: 10.1016/j.sleep.2012.02.014

Table 2.

Goodness-of-fit Indices for PSQI Measurement Models

Model χ2
(df)		 RMSEA WRMR CFI TLI Model
Comparison		 χ2diff
1. 1 factor 58.02
(11)		 0.12 1.06 0.90 0.89 - -
2. Kotronoulas et al.
   2 factor		 58.13
(10)		 0.12 1.06 0.90 0.88 2 vs. 1 0.32
(p = .57)
3. Magee et al.
   2 factor		 32.47
(11)		 0.08 0.76 0.96 0.95 3 vs. 1 22.49
(p < .001)
4. Cole et al.
   3 factor		 22.79
(9)		 0.07 0.63 0.97 0.96 4 vs. 2 33.48
(p < .001)
4 vs. 3 8.90
(p = .01)

CFI, comparative fit index; RMSEA, root mean square error of approximation; TLI, Tucker-Lewis Index; WRMR, weighted root mean residual. All absolute measures of model fit (χ2) were statistically significant (p < .05).