Table 6 Subgroup analysis: Associations between the number of teeth and all-cause mortality
| Â | Number of teeth | ||||
|---|---|---|---|---|---|
|  |  ≥ 20 |  < 20 |  |  | |
Variable (number of cases/number of samples) | HR | HR | (95% CI) | p value | |
Sex | |||||
 Men | 153/960 | 1.0 | 1.775 | (1.012–3.114) | 0.045* |
 Women | 66/1248 | 1.0 | 1.382 | (0.565–3.380) | 0.479 |
Age | |||||
 < 65 years | 48/1241 | 1.0 | 1.031 | (0.411–2.583) | 0.948 |
 ≥ 65 years | 170/959 | 1.0 | 3.126 | (1.651–5.922) |  < 0.001* |
BMI | |||||
 ≤ 18.5 | 16/82 | 1.0 | 0.908 | (0.155–5.314) | 0.915 |
 18.5< , ≤ 25 | 136/1477 | 1.0 | 1.527 | (0.859–2.711) | 0.149 |
 25<  | 61/612 | 1.0 | 2.149 | (0.800–5.771) | 0.129 |
Smoking habit | |||||
 No | 150/1577 | 1.0 | 2.412 | (1.364–4.266) | 0.002* |
 Yes | 48/366 | 1.0 | 0.673 | (0.263–1.723) | 0.409 |
Alcohol consumption | |||||
 < 20 g | 143/1524 | 1.0 | 1.687 | (0.976–2.916) | 0.061 |
 ≥ 20 g | 40/403 | 1.0 | 1.894 | (0.719–4.992) | 0.196 |
Educational status | |||||
 High | 33/341 | 1.0 | 3.229 | (0.922–11.302) | 0.067 |
 Middle | 106/1028 | 1.0 | 1.809 | (0.967–3.385) | 0.064 |
 Low | 45/454 | 1.0 | 1.218 | (0.487–3.043) | 0.673 |
Hypertension | |||||
 Yes | 82/687 | 1.0 | 2.686 | (1.285–5.614) | 0.009* |
 No | 66/849 | 1.0 | 1.049 | (0.543–2.025) | 0.887 |
Diabetes mellitus | |||||
 Yes | 16/84 | 1.0 | 0.999 | (0.244–4.088) | 0.999 |
 No | 132/1452 | 1.0 | 1.715 | (1.035–2.841) | 0.036* |
Perceived mental stress | |||||
 Never | 18/104 | 1.0 | 2.816 | (0.373–21.271) | 0.316 |
 Not very often | 61/556 | 1.0 | 1.214 | (0.502–2.937) | 0.667 |
 Some of the time | 113/1226 | 1.0 | 1.628 | (0.826–3.21) | 0.159 |
 Most of the time | 24/305 | 1.0 | 3.109 | (0.658–14.692) | 0.152 |