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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.