Table 6. Linear regression analysis for RC% at T2.
| Variables | β | SE | t | p |
|---|---|---|---|---|
| Constant | 59.991 | 6.723 | 8.924 | <0.001* |
| RD | -19.598 | 4.396 | -4.458 | <0.001* |
| Location (Anterior) | -14.860 | 6.274 | -2.369 | 0.021* |
| Variables not included in the model | β | t | p | |
| KTW | 0.110 | 0.990 | 0.326 | |
| GT | 0.089 | 0.818 | 0.416 | |
| RW | -0.061 | -0.460 | 0.647 | |
| Phenotype | 0.173 | 1.617 | 0.111 | |
| PI | 0.133 | 1.203 | 0.233 | |
| GI | 0.052 | 0.483 | 0.631 | |
| PD | -0.125 | -1.102 | 0.275 | |
| BOP% | 0.010 | 0.092 | 0.927 | |
| Gender (Male) | 0.160 | 1.470 | 0.147 | |
| Age | -0.010 | -0.091 | 0.928 | |
| Location (Mandible) | 0.014 | 0.131 | 0.897 | |
| Follow-up period (months) | 0.066 | 0.541 | 0.590 | |
| F:12.025, p<0.001* | R2:0.276, Adjusted R2:0.253 | |||
*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, T2: 12–48 months after the I-PRF procedure.