Demographic characteristics of patients; values are number (%) unless otherwise stated
| Geneva (n=55) | Rotterdam (n=96) | p Value | |
|---|---|---|---|
| Sex (boys:girls) | 34:21 | 55:41 | 0.71 |
| Median (range) at admission (days) | 108 (11–341) | 79 (9–256) | 0.17 |
| Mean (SD) gestational age (weeks) | 38.2 (3.3) | 38.0 (3.0) | 0.79 |
| Risk factors | |||
| Gestation < 37 weeks | 10 (18.2) | 23 (24.0) | 0.53 |
| Age < 6 weeks | 9 (16.4) | 23 (24.0) | 0.37 |
| Cardiac malformation | 2 (3.6) | 3 (3.1) | |
| Bronchopulmonary dysplasia | 2 (3.6) | 4 (4.2) | |
| T cell immune deficiency | 0 | 0 | |
| No risk factor | 34 (61.8) | 53 (55.2) | 0.53 |
| Breast feeding | |||
| > 1 month | 35 (70.0) | 23 (29.1) | 0.0001 |
| At admission | 25 (50.0) | 24 (31.2) | 0.051 |
| Asthma in family1-150 | 8 (25.8) | 14 (26.4) | 1.00 |
| Eczema in family1-150 | 2 (6.5) | 10 (18.5) | 0.20 |
| Median (range) No of children in the household1-150 | 2 (1–4) | 2 (1–8) | 1.00 |
| Daycare attendance1-150 | 3 (9.7) | 3 (5.7) | 0.67 |
| Smoking in the household1-150 | 12 (40.0) | 23 (46.9) | 0.64 |
↵1-150 Data from the prospectively collected cohort (season 1994–5) only.
Differences between Geneva and Rotterdam cohorts were tested by the χ2 or Fisher’s exact test for dichotomous variables and by Mann-Whitney U test for continuous variables.