Table 1 Demographic data in the test (subgingival instrumentation + subgingival erythritol air-polishing) and control (subgingival instrumentation alone) groups at baseline
Variable | Test group (n = 21) | Control group (n = 21) | U-test (p) |
|---|---|---|---|
Age (years; mean ± SD) | 50.23 ± 8.26 | 54.29 ± 7.44 | 0.144 |
Male/female (n) | 14 /7 | 11 /10 | 0.537a |
Smoker | 7 | 3 | 0.281a |
number of teeth (mean ± SD) | 25.86 ± 3.53 | 26.00 ± 3.08 | 0.949 |
PD (mm, mean ± SD) | 3.14 ± 0.39 | 3.08 ± 0.36 | 0.697 |
number of PD ≥ 5 mm (mean ± SD) | 29.88 ± 15.27 | 27.62 ± 6.54 | 0.667 |
CAL (mm, mean ± SD) | 3.50 ± 0.45 | 3.52 ± 0.44 | 0.857 |
BOP (%, mean ± SD) | 28.8 ± 31.6 | 27.9 ± 16.5 | 0.529 |
API (%, mean ± SD) | 16.9 ± 9.7 | 24.3 ± 20.7 | 0.412 |