Table 4 Multivariate logistic regression model for gingival bleeding (method: backward)
Variables | OR | 95% CI | P value |
|---|---|---|---|
Age group | |||
12 years | 1.09 | 0.876–1.356 | 0.441 |
13 years | 1.27 | 1.027–1.571 | 0.028 |
14 years | 1 | NA | NA |
15 years | 1.354 | 1.1–1.667 | 0.004 |
Region | |||
Shouguang, Weifang | 1.288 | 1.032–1.608 | 0.025 |
Huancui, Weihai | 2.109 | 1.686–2.636 | < 0.001 |
Hedong, Linyi | 1.233 | 0.989–1.537 | 0.063 |
Pingyi, Linyi | 1 | NA | NA |
Q5 frequency of brushing (n = 3356) | |||
≥ 2/day | 1 | NA | NA |
1/day | 1.235 | 1.028–1.483 | 0.024 |
< 1/day | 1.791 | 1.373–2.335 | < 0.001 |
Q8 frequency of using dental floss | |||
Never | 1.928 | 1.373–2.706 | < 0.001 |
Occasionally | 1 | NA | NA |
Weekly use | 0.642 | 0.135–3.061 | 0.579 |
Daily use | 1.24 | 0.311–4.954 | 0.76 |
Q19a is gingival bleeding normal when brushing your teeth? | |||
Yes | 1.516 | 1.225–1.875 | < 0.001 |
Do not know | 1.322 | 1.025–1.704 | 0.031 |
No | 1 | NA | NA |