Table 6 Incidence of gingival bleeding and calculus among a sample of 12–15 years old in Gansu province of China (n = 3848)
Characteristics | Gingival bleeding | Calculus | ||
|---|---|---|---|---|
Means | Rate % | Means | Rate % | |
Gender | – | – | – | – |
Female | 5.69 ± 6.84 | 71.9 | 7.54 ± 6.35 | 86.4 |
Male | 5.24 ± 6.43 | 68.5 | 6.69 ± 5.79 | 84.9 |
District | – | – | – | – |
Urban | 5.24 ± 6.12 | 72.5 | 5.54 ± 5.06 | 80.8 |
Rural | 5.69 ± 7.13 | 67.9 | 8.71 ± 6.61 | 90.5 |
Age (years) | – | – | – | – |
12 | 4.93 ± 5.88 | 67.2 | 5.45 ± 5.00 | 78.9 |
13 | 5.33 ± 6.48 | 70.5 | 6.83 ± 5.93 | 86.2 |
14 | 5.41 ± 6.98 | 68.7 | 7.60 ± 6.38 | 87.0 |
15 | 6.17 ± 7.07 | 74.4 | 8.51 ± 6.49 | 90.1 |
Total | 5.46 ± 6.64 | 70.2 | 7.11 ± 6.09 | 85.6 |