Table 1 Distribution of selected characteristics in 23,388 schoolchildren, Ryukyus Child Health Study, Japan
Variable | No. (%) or mean (SD) |
|---|---|
Age (% years) | Â |
   6-8 | 7063 (30.2) |
   9-11 | 8467 (36.2) |
   12-15 | 7858 (33.6) |
Male sex (%) | 11,509 (49.2) |
Municipality (%) | Â |
   Naha City | 19,206 (82.1) |
   Nago City | 4182 (17.9) |
Siblings (%) | Â |
   0 | 2144 (9.2) |
   1 | 7864 (33.6) |
   2 | 8823 (37.7) |
   3+ | 4557 (19.5) |
Smoking in household (%) | Â |
   Never | 10,083 (43.1) |
   Former | 2381 (10.2) |
   Current | 10,924 (46.7) |
Paternal history of allergic diseases (%)1 | 5495 (23.5) |
Maternal history of allergic diseases (%)1 | 6612 (28.3) |
Paternal educational level (%) | Â |
   Junior high school | 1813 (7.8) |
   High school | 10,394 (44.4) |
   Junior college or vocational technical school | 3484 (14.9) |
   University | 7697 (32.9) |
Maternal educational level (%) | Â |
   Junior high school | 1173 (5.0) |
   High school | 10,330 (44.2) |
   Junior college or vocational technical school | 9788 (41.9) |
   University | 2097 (9.0) |
Body mass index (kg/m2) | 17.8 (3.1) |
Daily nutrient intake2 | Â |
   Total Energy (kJ) | 8358.9 (2253.2) |
   Polyunsaturated fatty acids (g) | 14.3 (3.1) |
   n-3 Polyunsaturated fatty acids (g) | 2.0 (0.6) |
   α-Linolenic acid (18:3 n-3) (g) | 1.6 (0.5) |
   Eicosapentaenoic acid (20:5 n-3) (g) | 0.11 (0.09) |
   Docosahexaenoic acid (22:6 n-3) (g) | 0.27 (0.15) |
   n-6 Polyunsaturated fatty acids (g) | 10.2 (2.7) |
   Linoleic acid (18:2 n-6) (g) | 10.0 (2.7) |
   Arachidonic acid (20:4 n-6) (g) | 0.12 (0.04) |