Table 10.
Multiple logistic regression model analysis for clinical grading with various factors
| Clinical grading with various factors | ||||
|---|---|---|---|---|
| Factors | Model fitting criteria | Likelihood ratio tests | ||
| −2 Log likelihood of reduced model | Chi-square | df | Sig. | |
| Gender | 213.814 | 0.429 | 2 | 0.807 |
| Age | 215.211 | 1.827 | 8 | 0.986 |
| Habit factor | 222.176 | 8.791 | 8 | 0.360 |
| Frequency | 244.279 | 30.894 | 6 | 0.000 |
| Duration | 221.147 | 7.762 | 8 | 0.457 |
| Contents | 214.816 | 1.431 | 2 | 0.489 |
| Chewing time | 223.263 | 9.878 | 6 | 0.130 |
This reduced model is equivalent to the final model because omitting the effect does not increase the degrees of freedom. Unexpected singularities in the Hessian matrix are encountered