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Table 1 Comparaison between respondents and non-respondents to the 2-year follow-up questionnaire

From: Maternal fish and shellfish consumption and wheeze, eczema and food allergy at age two: a prospective cohort study in Brittany, France

Variables Respondents Non-respondents p-value*
n = 1500 n =1496
No (%) No (%)
Maternal factors
Fish consumption
  <1 time a month 252 (16.8) 307 (20.7) 0.001
  1–4 times a month 815 (54.3) 823 (55.5)  
  ≥2 times a week 433 (28.9) 352 (23.8)  
Shellfish consumption
  <1 time a month 1004 (66.9) 982 (65.9) 0.57
  ≥1 time a month 496 (33.1) 507 (34.1)  
Age (years)
  <28 445 (29.7) 535 (35.8) <0.001
  28 ≤ age < 32 542 (36.1) 524 (35.0)  
  ≥32 513 (34.2) 437 (29.2)  
Education
  ≤12 years 497 (33.2) 659 (44.2) <0.001
  >12 years 1000 (66.8) 832 (55.8)  
Tobacco smoke at the beginning of pregnancy
  No 1126 (75.6) 992 (67.2) <0.001
  Yes 364 (24.4) 484 (32.8)  
Folic acid supplementation
  Yes 251 (17.0) 235 (16.1) 0.50
  No 1225 (83.0) 1226 (83.9)  
Child/perinatal factors
Child’s sex
  Male 772 (51.5) 747 (50.0) 0.40
  Female 727 (48.5) 748 (50.0)  
Cesarean section
  Yes 255 (17.3) 258 (17.6) 0.84
  No 1218 (82.7) 1208 (82.4)  
Preterm birth (<37 weeks of gestation)
  Yes 49 (3.3) 60 (4.0) 0.26
  No 1447 (96.7) 1422 (96.0)  
Small-for-gestational age (<10th percentile)
  Yes 97 (6.5) 94 (6.3) 0.84
  No 1401 (93.5) 1400 (93.7)  
No. of siblings at birth
  0 645 (43.2) 667 (44.6) 0.68
  1 562 (37.6) 548 (36.7)  
  ≥2 287 (19.2) 276 (18.5)  
  1. *Chi square test.