Table 5.
Confounding variables for irregularity reduction, estimate, 95% confidence intervals, and estimate values for interactions
| Model 1 | Model 2 | |||||
|---|---|---|---|---|---|---|
| Estimate | 95% CI | p value | Estimate | 95% CI | p value | |
| Intercept | 7.28 | 0.002 | 9.56 | < 0.001 | ||
| Group (superelastic NiTi/heat-activated Cu-NiTi) | 1.10 | (− 1.31, 3.51) | 0.370 | - | - | - |
| Diameter | ||||||
| (No archwire/0.014) | 4.01 | (2.51, 5.51) | < 0.001 | 3.60 | (2.50, 4.70) | < 0.001 |
| (0.018/0.014) | 0.24 | (− 1.04, 1.51) | 0.715 | 0.23 | (− 0.64, 1.11) | 0.597 |
| Intercanine width | − 0.12 | (− 0.25, − 0.00) | 0.048 | − 0.05 | (− 0.06, 0.16) | 0.367 |
| Intermolar width | 0.08 | (− 0.43, 0.60) | 0.055 | - | - | - |
| Gender (female/male) | 0.16 | (− 0.35, 0.67) | 0.537 | - | - | - |
| Time | − 1.45 | (− 2.05, − 0.85) | < 0.001 | − 1.54 | (− 1.96, − 1.13) | < 0.001 |
| Group × diameter | ||||||
| (Superelastic NiTi/heat-activated Cu-NiTi) × (no archwire/0.014) | − 0.82 | (− 2.97, 1.33) | 0.453 | - | - | - |
| (Superelastic NiTi/heat-activated Cu-NiTi) × (0.018/0.014) | − 0.02 | (− 1.73, 1.69) | 0.982 | - | - | - |
| Group × time | ||||||
| (Superelastic NiTi/heat-activated Cu-NiTi) × time | − 0.17 | (− 1.01, 0.66) | 0.686 | - | - | - |