| 
 | Test indicators | 
 | ||
| Chi.sq statistic | Chi.sq df | Prob. | Selected model | |
| FD1 | 30.719882 | 5.8 | 0.001 | Fixed effect model | 
| FD2 | 31.706525 | 5.5 | 0.020 | Fixed effect model | 
| FD3 | 30.064112 | 6.0 | 0.001 | Fixed effect model | 
| FD4 | 33.199601 | 5.8 | 0.000 | Fixed effect model |