|   模型  |       χ2  |       df  |       RMSEA  |       CFI  |       TLI  |       SRMR  |       Δχ2  |       Δdf  |       p  |    
|   M1  |       29.77  |       7  |       0.16  |       0.97  |       0.94  |       0.06  |       
  |       
  |       
  |    
|   M2  |       19.26  |       3  |       0.12  |       0.98  |       0.90  |       0.05  |       10.51a  |       4  |       0.02  |    
|   M3  |       10.48  |       3  |       0.07  |       0.98  |       0.96  |       0.05  |       19.29b  |       4  |       <0.001  |    
|   M4  |       7.23  |       1  |       0.02  |       0.99  |       0.98  |       0.02  |       22.54c  |       6  |       <0.001  |