TABLE 1

Distribution of Background Characteristics and Median Duration of Exclusive Breastfeeding

Background Variablesn (%) (N = 1018)Duration of Exclusive Breastfeeding, Median (Range), moPa
Season of birth.030
    Spring (April to May)189 (19)1.8 (0.0–6.0)
    Summer (June to August)227 (22)2.0 (0.0–8.0)
    Autumn (September to November)258 (25)1.2 (0.0–6.0)
    Winter (December to March)344 (34)1.9 (0.0–10.0)
Gender.437
    Male551 (54)1.6 (0.0–10.0)
    Female467 (46)1.8 (0.0–8.0)
No. of siblings at child's birth.620
    0428 (42)1.6 (0.0–10.0)
    1326 (32)1.8 (0.0–8.0)
    ≥2245 (24)1.8 (0.0–6.0)
    Missing information19 (2)1.8 (0.0–5.0)
Parental asthma.655
    Yes126 (12)1.6 (0.0–6.0)
    No740 (73)1.8 (0.0–10.0)
    Missing information152 (15)1.5 (0.0–8.0)
Parental allergic rhinitis.431
    Yes528 (52)1.8 (0.0–10.0)
    No299 (29)1.8 (0.0–6.0)
    Do not know40 (4)1.8 (0.0–5.5)
    Missing information151 (15)1.4 (0.0–8.0)
Maternal age<.001
    <25 y166 (16)1.4 (0.0–5.5)
    25–29.9 y343 (34)1.4 (0.0–6.0)
    30–34.9 y312 (31)2.5 (0.0–8.0)
    ≥35 y197 (19)2.3 (0.0–10.0)
Maternal basic education<.001
    Less than high school375 (37)1.4 (0.0–8.0)
    High school616 (61)2.0 (0.0–10.0)
    Missing information27 (3)1.6 (0.0–5.0)
Maternal smoking in pregnancy<.001
    No909 (89)1.8 (0.0–10.0)
    Yes87 (9)0.9 (0.0–5.0)
    Missing information23 (2)2.1 (0.0–6.0)
Mode of delivery.023
    Normal889 (87)1.8 (0.0–8.0)
    Cesarean section120 (12)1.0 (0.0–10.0)
    Missing information9 (1)0.5 (0.0–3.5)
Ponderal index.460
    First quartile251 (25)1.6 (0.0–6.0)
    Second quartile253 (25)2.0 (0.0–10.0)
    Third quartile253 (25)1.8 (0.0–6.0)
    Fourth quartile250 (24)1.4 (0.0–8.0)
    Missing information11 (1)0.5 (0.0–3.5)
Pets at home during first year.440
    No596 (58)1.9 (0.0–10.0)
    Yes273 (27)1.8 (0.0–6.0)
    Missing information149 (15)1.4 (0.0–8.0)
  • a P values were calculated with the Mann-Whitney U test (for variables with 2 categories and Kruskal-Wallis test (for variables with >2 categories).