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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