Background data according to questionnaire for the 18-month-old children
| High prescription area % (n = 570) | Low prescription area % (n = 278) | P | |
|---|---|---|---|
| Boys | 49.8 | 56.1 | 0.08 |
| Any siblings | 56.7 | 59.4 | 0.46 |
| Asthma | 9.9 | 14.3 | 0.08 |
| Day-care outside the home | 70.7 | 60.1 | 0.002 |
| Living in rental flat | 24.4 | 21.5 | 0.35 |
| Smoker in the family | 15.0 | 8.8 | 0.012 |
| Single parent | 4.7 | 4.0 | 0.61 |
| Mother without post-upper secondary | 59.0 | 60.0 | 0.98 |
| Father without post-upper secondary | 68.7 | 68.6 | 0.69 |
| Either parent unemployed | 5.4 | 8.1 | 0.13 |
| No health care education in the family | 60.3 | 59.6 | 0.93 |
| Both parents born outside the Nordic countries | 4.0 | 2.5 | 0.26 |
| Perceived as infection prone | 17.5 | 17.0 | 0.88 |
| High or medium level of concern about infectious illness | 45.0 | 39.6 | 0.14 |
| Inadequate expectations of antibiotics effects | 58.1 | 57.2 | 0.80 |