Table 3 Selection of final log-linear model

Model (1): all main effect terms

311.44(196)

<0.0001

Model (2): all two-factor interaction terms

86.13(160)

1.00

Model (3): starting model

All two-factor interaction terms related to SS

77.82(108)

0.987

Model (4): model fit well

PS*GI, GI*SM, SP*PH, GI*SP, SP*SM, GI*CB, PS*FF, FF*PH, CD*PS, GI*FF, CB*PH, GI*CD, CD*SM, CB*FF, CB*CD, CD*SP, CD*FF

101.34(126)

0.948

Difference between Model (3) and Model (4)

23.42(18)

>0.10

Model (5): final model

GI

82.38(76)

0.29