AB- N=227 AB+ N=114 AB2 N=32 AB7 N=82
Age median (IQR)* 5 (4.6-5.9) 4.7 (4.4-5.0) 4.7 (4.4-5.3) 4.7 (4.4-5.0)
Sex (male n,%) 122 (54) 65 (57) 14 (44) 51 (62)
BMI mean (SD) 15.6 (1.5) 15.6 (1.4) 15.7 (1.4) 15.5 (1.4)
Delivery mode* n (%) Vaginal C-Section 146 (64) 81 (36) 86 (75) 28 (25) 22 (69) 10 (31) 64 (78) 18 (22)
Breastfeeding Median duration (IQR) Median duration exclusive (IQR) 4 (1-8) 2 (0-5) 2.5 (1-7) 0 (0-4) 2 (0-7) 0 (0-6) 3.5 (1-6) 0.5 (0-4)
Pets n (%) No Cat Dog Cat + dog Other 84 (37) 59 (26) 37 (16) 23 (10) 24 (11) 45 (39) 34 (30) 18 (16) 7 (6) 10 (9) 11 (34) 9 (28) 6 (19) 3 (9) 3 (9) 34 (42) 25 (31) 12 (15) 4 (5) 7 (9)
Daycare attendance n (%) No <3 months 3-6 months >6 months 73 (32) 25 (11) 99 (44) 30 (13) 32 (28) 24 (21) 38 (33) 20 (18) 11 (34) 4 (13) 10 (31) 7 (22) 21 (26) 20 (24) 28 (34) 13 (16)
Siblings n (%) Yes No Missing 120 (53) 100 (44) 7 (3) 69 (61) 41 (36) 4 (4) 18 (56) 12 (38) 2 (6) 51 (62) 29 (35) 2 (2)
Parental atopic disease n (%) Yes No Missing 141 (62) 79 (35) 7 (3) 64 (56) 46 (40) 4 (4) 21 (66) 9 (28) 2 (6) 43 (52) 37 (45) 2 (2)
Highest level of education n (%) Low/middle High Unknown 44 (19) 174 (77) 9 (4) 28 (25) 80 (70) 6 (5) 10 (31) 19 (59) 3 (9) 18 (22) 61 (74) 3 (4)
Number of courses in the first year of life (first week excluded) median (IQR)1 0 (0-1) 0 (0-1) 0 (0-0) 0 (0-1)
AB free months in the first year of life*1 (first week excluded) median (IQR) 9 (7-11) 7 (2-9) 8 (7-10.5) 7 (2-9)
Number of courses after first week in the first 2 years2 median (IQR) 1 (1-2) 1 (1-2) 1 (1-4) 1 (1-2)
Eczema first year of life n (%) Yes No 79 (35) 148 (65) 40 (35) 74 (65) 12 (38) 20 (63) 28 (34) 54 (66)