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. 2012 Oct 15;12:142. doi: 10.1186/1471-230X-12-142

Table 2.

Measurements of model fit for the structure models

Model Chi Square Test
 Baseline comparison
 Departure from saturated models
 Parsimony
 Conclusion
χ2 DF P-value (NS*) CFI (>0.9*) RMSEA (90% CI) (<0.05*) p-value (NS*) 1-PCFI AIC  
Three Major Theoretical Models
 M1. Correlational model (Figure 1a)
 76.4
 66
 0.18 NS
 0.99
 0.02 (0–0.04).
 0.99 NS
 0.38
 182
 Good fit
M2. Simple model (Figure 1b)
 36.2
 31
 0.24 NS
 0.99
 0.02 (0–0.04)
 0.93 NS
 0.46
 104
 Good Fit
M3. Causal model (Figure 1c)
 77.0
 69
 0.24 NS
 0.99
 0.02 (0–0.04)
 0.99 NS
 0.35
 177
 Good Fit
Three Extended Causal Models (Revision of M3 to further investigate association between emotional symptoms and sleep problems)
 M3.1. Pruned emotional symptoms causal model (Figure 2a)
 75.5
 48
 <0.01
 0.96
 0.05 (0.02-0.06)
 0.64
 0.41
 160
 Poor Fit**
M3.2. Emotional symptoms and sleep problems correlational model (Figure 2b)
 75.1
 69
 0.29 NS
 0.99
 0.02 (0–0.04)
 0.99 NS
 0.35
 175
 Good Fit
M3.3. Emotional symptoms to sleep problems causal model (Figure 2c)
 75.1
 69
 0.29 NS
 0.99
 0.02 (0–0.04)
 0.99 NS
 0.35
 175
 Good fit
Five Replicated Models (Using an alternative scale for functional disability) M1 Replicate
 75.1
 58
 0.07
 0.97
 0.03 (0–0.05)
 0.93 NS
 0.38
 167
 Good fit
M2 Replicate
 46
 33
 0.06
 0.94
 0.04 (0–0.06)
 0.78 NS
 0.44
 110
 Good fit
M3 Replicate
 89
 71
 0.07
 0.97
 0.03 (0–0.05)
 0.97 NS
 0.34
 185
 Good fit
M3.2 Replicate
 89
 71
 0.07
 0.97
 0.03 (0–0.05)
 0.97 NS
 0.34
 185
 Good fit
M 3.3 Replicate 89 71 0.07 0.97 0.03 (0–0.05) 0.97 NS 0.34 185 Good fit

Note. **A poor fit of M3.1 counter proves the validity of the causal model M3.