Table 1 Characteristics of the children in whom the events and population time were sampled from
From: Asthma occurrence in children and early life systemic antibiotic use: an incidence density study
|  | First asthma events (n = 47) | Population moments (n = 147) |
|---|---|---|
Age, months, median (min; max) | 48 (18; 108) | 42 (18; 108) |
Sex, female, n (%) | 15 (31.9) | 70 (47.6) |
Parental education, high, n (%) | 38 (86.4) | 122 (88.4) |
Day-care attendance, yes, n (%) | 33 (82.5) | 118 (82.5) |
ETS, yes, n (%) | 7 (20.6) | 10 (6.8) |
Breastfed for at least 6Â months, yes, n (%) | 10 (22.7) | 46 (31.7) |
LRTIs first year of life, yes, n (%) | 12 (26.1) | 39 (26.7) |
Paracetamol (acetaminophen) use first year of life, yes, n (%) | 40 (87.0) | 115 (82.1) |
Parental asthma, yes, n (%) | 9 (20.5) | 22 (15.9) |
Atopic dermatitis, yes, n (%) | 31 (70.5) | 61 (44.9) |
Number of systemic antibiotic courses in the first year of life, n (%) | ||
 0 | 20 (42.6) | 69 (46.9) |
 1 | 6 (12.8) | 21 (14.3) |
 2 | 4 (8.5) | 17 (11.6) |
 3 | 3 (6.4) | 12 (8.2) |
 4 | 3 (6.4) | 7 (4.8) |
 5 | 3 (6.4) | 3 (2.0) |
 6 | 3 (6.4) | 6 (4.1) |
 7 | 1 (2.1) | 7 (4.8) |
 8 | 1 (2.1) | 2 (1.4) |
 9 | 1 (2.1) | 2 (1.4) |
 11 | 1 (2.1) | 0 (0.0) |
 13 | 1 (2.1) | 1 (0.7) |
Courses systemic antibiotics in the first year of life | Â | Â |
 Excessive (≥ 4 courses)* | 14 (29.8) | 28 (19.0) |
 Non-excessive (< 4 courses) | 33 (70.2) | 119 (80.9) |