Table 1.
Characteristics of the subjects by the number of teeth (brackets contain percent)
| Number of teeth | p value1 | ||||
|---|---|---|---|---|---|
| Q1 | Q2 | Q3 | Q4 | ||
| Number of teeth, range | |||||
| 50–59 | 0–19 | 20–25 | 26–27 | 28 | |
| 60–69 | 0–14 | 15–21 | 22–26 | 27–28 | |
| 70–79 | 0–6 | 7–17 | 18–24 | 25–28 | |
| 80- | 0 | 1–7 | 8–19 | 20–28 | |
| n | 493 | 485 | 529 | 542 | |
| Sex | |||||
| Men | 242 (49.1) | 204 (42.1) | 223 (42.2) | 239 (44.1) | 0.09 |
| Women | 251 (50.9) | 281 (57.9) | 306 (57.8) | 303 (55.9) | |
| Age, mean, SD | 68.5, 9.4 | 66.5, 9.3 | 66.9, 8.5 | 66.0, 9.2 | < 0.01 |
| Age group | |||||
| 50–59 | 97 (19.7) | 131 (27.0) | 94 (17.8) | 143 (26.4) | < 0.01 |
| 60–69 | 190 (38.5) | 161 (33.2) | 240 (45.4) | 195 (36.0) | |
| 70–79 | 145 (29.4) | 153 (31.5) | 146 (27.6) | 152 (28.0) | |
| 80- | 61 (12.4) | 40 (8.2) | 49 (9.3) | 52 (9.6) | |
| Smoking | |||||
| Former smoker | 110 (22.4) | 92 (19.0) | 114 (21.6) | 110 (20.3) | < 0.01 |
| Current smoker | 93 (18.9) | 64 (13.2) | 52 (9.8) | 46 (8.5) | |
| Use of antidiabetic medications | 65 (13.2) | 43 (8.9) | 36 (6.8) | 42 (7.8) | < 0.01 |
| Household income2 | |||||
| Low | 148 (33.9) | 117 (26.5) | 108 (22.5) | 94 (18.9) | < 0.01 |
| High | 289 (66.1) | 324 (73.5) | 372 (77.5) | 404 (81.1) | |
| Equivalent household expenditure3 | |||||
| Low | 273 (61.1) | 227 (51.6) | 209 (42.1) | 233 (45.3) | < 0.01 |
| High | 174 (38.9) | 213 (48.4) | 287 (57.9) | 281 (54.7) | |
| Educational attainment4 | |||||
| Low | 414 (84.5) | 381 (78.9) | 408 (77.1) | 385 (71.0) | < 0.01 |
| High | 76 (15.5) | 102 (21.1) | 121 (22.9) | 157 (29.0) | |
1Analysis of variance for continuous variable and chi-square test for categorical variable
2Low, < 2 million JPY; high, ≥ 2 million JPY
3Low, < 133 thousand JPY; high, ≥ 133 thousand JPY
4Low, up to high school; high, college or more