Table 2.
Incidence proportion and rank of median D4−6MFT scores among independent variables (n = 1,016).
| Independent variables | n (%) | Dentin caries | |||
|---|---|---|---|---|---|
| Incidence proportion n (%) | pa | Rank of median D4−6MFT score | pb | ||
| Sex | 0.038 | 0.063 | |||
| Female | 425 (41.8) | 173 (40.7) | 527 | ||
| Male | 591 (58.2) | 203 (34.3) | 495 | ||
| Residence | 0.360 | 0.549 | |||
| Suburban | 516 (50.8) | 198 (38.4) | 503 | ||
| Urban | 500 (49.2) | 178 (35.6) | 513 | ||
| Caregiver | 0.175 | 0.115 | |||
| Other people | 278 (27.4) | 93 (33.5) | 521 | ||
| Father | 111 (10.9) | 37 (33.3) | 489 | ||
| Mother | 627 (61.7) | 246 (39.2) | 486 | ||
| Education of caregiver | 0.128 | 0.807 | |||
| ≥9 years | 153 (15.1) | 65 (42.5) | 508 | ||
| <9 years | 863 (84.9) | 311 (36.0) | 513 | ||
| Household monthly income (CNY) | 0.738 | 0.691 | |||
| <3,000 | 238 (23.4) | 93 (39.1) | 519 | ||
| 3,000-7,000 | 616 (60.6) | 223 (36.2) | 503 | ||
| ≥7,000 | 162 (15.9) | 60 (37.0) | 511 | ||
| One-child family | 0.011 | 0.379 | |||
| No | 788 (77.6) | 308 (39.1) | 522 | ||
| Yes | 228 (22.4) | 68 (29.8) | 504 | ||
| Frequency of tooth brushing | 0.092 | 0.608 | |||
| <2 times per day | 606 (59.6) | 237 (39.1) | 512 | ||
| ≥2 times per day | 410 (40.4) | 139 (33.9) | 503 | ||
| Dental flossing | 0.576 | 0.562 | |||
| No | 934 (91.9) | 348 (37.3) | 510 | ||
| Yes | 82 (8.1) | 28 (34.1) | 492 | ||
| Toothpaste | 0.332 | 0.237 | |||
| Non-fluoride | 266 (26.2) | 105 (39.5) | 524 | ||
| Fluoride | 750 (73.8) | 271 (36.1) | 502 | ||
| Frequency of snack consumption | 0.256 | 0.081 | |||
| ≥1 per day | 696 (68.5) | 269 (38.6) | 517 | ||
| Not every day | 320 (31.5) | 107 (33.4) | 488 | ||
| Frequency of sweet drink consumption | 0.268 | 0.841 | |||
| ≥1 per day | 365 (35.9) | 138 (37.8) | 510 | ||
| Not every day | 651 (64.1) | 238 (36.6) | 507 | ||
| Orthodontics appliance | 0.706 | 0.639 | |||
| Yes | 24 (2.4) | 8 (33.3) | 509 | ||
| No | 992 (97.6) | 368 (37.1) | 484 | ||
| Dental attendance in the past 6 months | 0.125 | 0.121 | |||
| Yes | 560 (55.1) | 219 (39.1) | 519 | ||
| No | 456 (44.9) | 157 (34.4) | 494 | ||
| Dental insurance | 0.478 | 0.359 | |||
| Yes | 234 (23.0) | 82 (35.0) | 495 | ||
| No | 782 (77.0) | 294 (37.6) | 512 | ||
| Saliva secretion (ml/min) | 0.300 | 0.279 | |||
| <0.25 | 234 (27.4) | 110 (39.6) | 522 | ||
| ≥0.25 | 782 (72.6) | 266 (36.0) | 503 | ||
| Saliva buffering capability (pH) | 0.121 | 0.197 | |||
| <3.5 | 321 (31.6) | 132 (41.1) | 526 | ||
| 3.5–4.25 | 300 (29.5) | 111 (37.0) | 509 | ||
| ≥4.25 | 395 (38.9) | 133 (33.7) | 492 | ||
| Past caries experience | <0.001 | <0.001 | |||
| Baseline D4−6MFT = 0 | 648 (63.8) | 204 (31.5) | 481 | ||
| Baseline D4−6MFT > 0 | 368 (36.2) | 172 (46.7) | 556 | ||
| Mean (SD) | ORc | pc | ORd | pd | |
| Plaque index | 1.31 (0.68) | 0.877 | 0.179 | 1.011 | 0.873 |
| Cariostat score | 1.78 (0.67) | 0.752 | 0.003 | 1.228 | 0.011 |
| Baseline age (years) | 13.19 (0.40) | 1.032 | 0.849 | 0.774 | 0.250 |
a
Chi-squared test.
b
Mann-Whitney U test or Kruskal-Wallis H test.
c
Logistic regression.
d
Negative binomial regression.