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Table 1 Distribution of selected characteristics in 23,388 schoolchildren, Ryukyus Child Health Study, Japan

From: Polyunsaturated fatty acid intake and prevalence of eczema and rhinoconjunctivitis in Japanese children: The Ryukyus Child Health Study

Variable No. (%) or mean (SD)
Age (% years)  
   6-8 7063 (30.2)
   9-11 8467 (36.2)
   12-15 7858 (33.6)
Male sex (%) 11,509 (49.2)
Municipality (%)  
   Naha City 19,206 (82.1)
   Nago City 4182 (17.9)
Siblings (%)  
   0 2144 (9.2)
   1 7864 (33.6)
   2 8823 (37.7)
   3+ 4557 (19.5)
Smoking in household (%)  
   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 (%)  
   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 (%)  
   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  
   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)
  1. 1 Asthma, atopic eczema, or allergic rhinitis.
  2. 2 Nutrient intake was adjusted for total energy intake using the residual method.