Table 1 Distribution of MIH in areas throughout Japan and age- or sex-specific prevalence of MIH
From: Prevalence of molar incisor hypomineralization and regional differences throughout Japan
Number of subjects | Percent | Number of subjects with MIH | Prevalence (%)§ | χ2 test | Odds ratioa | |
|---|---|---|---|---|---|---|
(95% confidence interval) | ||||||
Region | ||||||
Hokkaido | 235 | 5.2 | 33 | 14.01 (13.97–14.06) | < 0.001 | 1.00 |
Tohoku | 316 | 7.0 | 37 | 11.69 (11.65–11.72) | 0.81 (0.49–1.34) | |
Kanto Shin-Etsu | 1561 | 34.7 | 289 | 18.48 (18.46–18.50) | 1.40 (0.95–2.07) | |
Tokai Hokuriku | 601 | 13.4 | 116 | 19.26 (19.23–19.29) | 1.48 (0.97–2.24) | |
Kinki | 802 | 17.8 | 179 | 22.27 (22.25–22.30) | 1.77 (1.18–2.65) | |
Chugoku | 262 | 5.8 | 52 | 19.81 (19.76–19.86) | 1.54 (0.95–2.48) | |
Shikoku | 153 | 3.4 | 43 | 28.05 (27.98–28.12) | 2.43 (1.46–4.04) | |
Kyushu | 566 | 12.6 | 143 | 25.21 (25.20–25.23) | 2.07 (1.37–3.13) | |
Age (years) | ||||||
7 | 1533 | 34.1 | 341 | 22.2 | < 0.01 | 1.40 (1.16–1.68) |
8 | 1631 | 36.3 | 324 | 19.9 | 1.21 (1.00–1.46) | |
9 | 1332 | 29.6 | 227 | 17.0 | 1.00 | |
Sex | ||||||
Male | 2216 | 49.3 | 428 | 19.3 | 0.38 | 1.00 |
Female | 2280 | 50.7 | 464 | 20.4 | 1.07 (0.92–1.24) | |
Total | 4496 | 892 | 19.8 | |||