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Table 1 Distribution of selected characteristics in 1745 pregnant women

From: Seaweed consumption and prevalence of depressive symptoms during pregnancy in Japan: Baseline data from the Kyushu Okinawa Maternal and Child Health Study

Variable n (%)
Age, years, mean ± SD 31.2 ± 4.3
Gestation, weeks, mean ± SD 18.5 ± 5.4
Region of residence  
 Fukuoka Prefecture 971 (55.6)
 Other than Fukuoka Prefecture in Kyushu 592 (33.9)
 Okinawa Prefecture 182 (10.4)
Number of children  
 0 703 (40.3)
 1 690 (39.5)
 ≥ 2 352 (20.2)
Nuclear family structure 1474 (84.5)
History of depression 84 (4.8)
Family history of depression 175 (10.0)
Having ever smoked 563 (32.3)
Ever experiencing secondhand smoke exposure at home 1315 (75.4)
Ever experiencing secondhand smoke exposure at work 1106 (63.4)
Job typea  
 Unemployed 705 (40.4)
 Professional or technical 435 (24.9)
 Clerical or related occupation 328 (18.8)
 Sales 83 (4.8)
 Service 115 (6.6)
 Production 51 (2.9)
 Othersb 28 (1.6)
Household income, yen/year  
 < 4,000,000 632 (36.2)
 4,000,000 − 5,999,999 618 (35.4)
 ≥ 6,000,000 495 (28.4)
Education, years  
 < 13 428 (24.5)
 13 − 14 577 (33.1)
 ≥ 15 740 (42.4)
Body mass index, kg/m2, mean ± SD 21.4 ± 2.8
Daily nutrient intakec  
 Total energy, kJ, mean ± SD 7434.2 ± 2057.0
 Seaweed, g, mean ± SD 12.3 ± 12.7
 Fish, g, mean ± SD 46.7 ± 25.8
 Yogurt, g, mean ± SD 34.8 ± 39.5
  1. aFull-time or part-time employment in the year when the first questionnaire was conducted or in the previous year.
  2. bManagement; protection services; farming, fishing, or forestry; transportation or communications; or construction.
  3. cNutrient and food intake were adjusted for total energy intake using the residual method.