Table 5. Linear regression analysis for RC% at T1.
| Variables | β | SE | t | p |
|---|---|---|---|---|
| Constant | 27.916 | 10.936 | 2.553 | 0.013* |
| RD | -20.894 | 4.093 | -5.105 | <0.001* |
| KTW | 8.064 | 2.744 | 2.939 | 0.005* |
| Variables not included in the model | β | t | p | |
| GT | 0.034 | 0.329 | 0.744 | |
| RW | -0.037 | -0.280 | 0.780 | |
| Phenotype | 0.194 | 1.965 | 0.054 | |
| PI | -0.047 | -0.453 | 0.652 | |
| GI | -0.004 | -0.043 | 0.966 | |
| PD | 0.052 | 0.516 | 0.608 | |
| BOP% | 0.121 | 1.200 | 0.235 | |
| Gender (Male) | 0.093 | 0.920 | 0.361 | |
| Age | -0.040 | -0.389 | 0.699 | |
| Location (Mandible) | 0.106 | 0.848 | 0.400 | |
| Location (Anterior) | -0.127 | -1.242 | 0.219 | |
| Follow-up period (months) | 0.018 | 0.180 | 0.858 | |
| F:20.665, p<0.001* | R2:0.412, Adjusted R2:0.392 | |||
*p<0.05, β: Regression coefficient, SE: Standard error. RC%: Root coverage percentage, KTW: Keratinized tissue width, GT: Gingival thickness, RD: Recession depth, RW: Recession width, PI: Plaque index, GI: Gingival index, PD: Probing depth, BOP%: Bleeding on probing, T1: Nine months after the I-PRF procedure.