Table 1.
Distribution of characteristics of 1162 women, KOMCHS, Japan
| Variable | Number (%) or mean ± SD |
|---|---|
| Age (years) | 31.5 ± 4.2 |
| Region of residence | |
| Fukuoka Prefecture | 734 (63.2) |
| Other than Fukuoka Prefecture in Kyushu | 321 (27.6) |
| Okinawa Prefecture | 107 (9.2) |
| Smoking status | |
| Never | 818 (70.4) |
| Ever | 344 (29.6) |
| Toothbrushing frequency (times/day) | |
| < 2 | 149 (12.8) |
| 2 | 586 (50.4) |
| ≥ 3 | 427 (36.8) |
| Use of an interdental brush | |
| No | 627 (54.0) |
| Yes | 535 (46.0) |
| Household income (yen/year) | |
| < 4,000,000 | 374 (32.2) |
| 4,000,000–5,999,999 | 418 (36.0) |
| ≥ 6,000,000 | 370 (31.8) |
| Educational level (years) | |
| < 13 | 239 (20.6) |
| 13–14 | 386 (33.2) |
| ≥ 15 | 537 (46.2) |
| Total energy intake (kJ/day) | 7396.0 ± 1955.5 |
| Calcium intake (mg/day)* | 500.2 ± 220.9 |
*Calcium intake was adjusted for total energy intake using the residual method.