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Table 1 Distribution of selected characteristics in 1745 pregnant women, Kyushu Okinawa Maternal and Child Health Study, Japan

From: Sibling number and prevalence of allergic disorders in pregnant Japanese women: baseline data from the Kyushu Okinawa Maternal and Child Health Study

Variable n %
Region of residence   
   Fukuoka Prefecture 970 55.6
   Other than Fukuoka Prefecture in Kyushu 593 34.0
   Okinawa Prefecture 182 10.4
Pack-years of smoking   
   None 1182 67.7
   0.05-3.9 263 15.1
   ≥ 4.0 300 17.2
Ever secondhand smoke exposure at home 1315 75.4
Ever secondhand smoke exposure at work 1105 63.3
Family history of asthma 330 18.9
Family history of atopic eczema 302 17.3
Family history of allergic rhinitis 759 43.5
Household income (yen/year)   
   < 4,000,000 632 36.2
   4,000,000-5,999,999 620 35.5
   ≥ 6,000,000 493 28.3
Education (years)   
   < 13 429 24.6
   13-14 576 33.0
   ≥ 15 740 42.4
Total no. siblings   
   0 94 5.4
   1 788 45.2
   2 688 39.4
   ≥ 3 175 10.3
No. older siblings   
   0 829 47.5
   1 622 35.6
   ≥ 2 294 16.9
No. younger siblings   
   0 695 39.8
   1 695 39.8
   ≥ 2 355 20.3