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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.