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Page 2
| N | m (sd) | N | m (sd) | N | m (sd) | N | m (sd) | N | m (sd) | |||
| Child’s age when baseline questionnaire was completed (days) | 57 | 8.0 (11.4) | 30 | 7.3 (9.7) | 72 | 2.6 (1.5) | 49 | 2.4 (1.4) | 129 | 5.0 (8.0) | < 0.01+ | |
| N | % | N | % | N | % | N | % | N | % | |||
| Who is completing the questionnaire | Mother | 43 | 75.4 | 22 | 73.3 | 50 | 66.7 | 32 | 62.7 | 93 | 70.5 | 0.274* |
| Father | 14 | 24.6 | 8 | 26.7 | 25 | 33.3 | 19 | 37.3 | 39 | 29.5 | ||
| Missing | 0 | 0.0 | 0 | 0.0 | 0 | 0.0 | 0 | 0.0 | 0 | 0.0 | ||
| Home ownership | Yes | 43 | 75.4 | 25 | 83.3 | 56 | 74.7 | 39 | 76.5 | 99 | 75.0 | 0.975* |
| No | 14 | 24.6 | 5 | 16.7 | 18 | 24.0 | 11 | 21.6 | 32 | 24.2 | ||
| Missing | 0 | 0.0 | 0 | 0.0 | 1 | 1.3 | 1 | 2.0 | 1 | 0.8 | ||
| Mother’s education level | Primary school | 0 | 0.0 | 0 | 0.0 | 0 | 0.0 | 0 | 0.0 | 0 | 0.0 | 0.355* |
| Medium school | 9 | 15.8 | 2 | 6.7 | 9 | 12.0 | 5 | 9.8 | 18 | 13.6 | ||
| High school | 27 | 47.4 | 12 | 40.0 | 29 | 38.7 | 19 | 37.3 | 56 | 42.4 | ||
| University | 21 | 36.8 | 16 | 53.3 | 37 | 49.3 | 27 | 52.9 | 58 | 43.9 | ||
| missing | 0 | 0.0 | 0 | 0.0 | 0 | 0.0 | 0 | 0.0 | 0 | 0.0 | ||
| Father’s education level | Primary school | 0 | 0.0 | 0 | 0.0 | 0 | 0.0 | 0 | 0.0 | 0 | 0.0 | 0.574* |
| Medium school | 12 | 21.1 | 5 | 16.7 | 11 | 14.7 | 9 | 17.6 | 23 | 17.4 | ||
| High school | 35 | 61.4 | 20 | 66.7 | 48 | 64.0 | 29 | 56.9 | 83 | 62.9 | ||
| University | 9 | 15.8 | 5 | 16.7 | 15 | 20.0 | 12 | 23.5 | 24 | 18.2 | ||
| missing | 1 | 1.8 | 0 | 0.0 | 1 | 1.3 | 0 | 0.0 | 2 | 1.5 | ||
| Mother’s profession | Worker | 5 | 8.8 | 3 | 10.0 | 8 | 10.7 | 5 | 9.8 | 13 | 9.8 | 0.929# |
| Employee | 21 | 36.8 | 11 | 36.7 | 32 | 42.7 | 22 | 43.1 | 53 | 40.2 | ||
| Freelance | 7 | 12.3 | 5 | 16.7 | 6 | 8.0 | 5 | 9.8 | 13 | 9.8 | ||
| Housewife | 6 | 10.5 | 2 | 6.7 | 5 | 6.7 | 3 | 5.9 | 11 | 8.3 | ||
| Unemployed | 6 | 10.5 | 2 | 6.7 | 10 | 13.3 | 8 | 15.7 | 16 | 12.1 | ||
| Manager | 1 | 1.8 | 0 | 0.0 | 1 | 1.3 | 1 | 2.0 | 2 | 1.5 | ||
| Other | 9 | 15.8 | 7 | 23.3 | 13 | 17.3 | 7 | 13.7 | 22 | 16.7 | ||
| missing | 2 | 3.5 | 0 | 0.0 | 0 | 0.0 | 0 | 0.0 | 2 | 1.5 | ||
| Father’s profession | Worker | 14 | 24.6 | 8 | 26.7 | 17 | 22.7 | 11 | 21.6 | 31 | 23.5 | 0.997# |
| Employee | 19 | 33.3 | 11 | 36.7 | 25 | 33.3 | 19 | 37.3 | 44 | 33.3 | ||
| Artisan | 5 | 8.8 | 2 | 6.7 | 7 | 9.3 | 5 | 9.8 | 12 | 9.1 | ||
| Freelance | 9 | 15.8 | 4 | 13.3 | 12 | 16.0 | 6 | 11.8 | 21 | 15.9 | ||
| Unemployed | 1 | 1.8 | 0 | 0.0 | 3 | 4.0 | 1 | 2.0 | 4 | 3.0 | ||
| Manager | 2 | 3.5 | 1 | 3.3 | 2 | 2.7 | 2 | 3.9 | 4 | 3.0 | ||
| Other | 7 | 12.3 | 4 | 13.3 | 8 | 10.7 | 6 | 11.8 | 15 | 11.4 | ||
| missing | 0 | 0.0 | 0 | 0.0 | 1 | 1.3 | 1 | 2.0 | 1 | 0.8 | ||
| Gross family income | Up to €36,152 | 33 | 57.9 | 19 | 63.3 | 43 | 57.3 | 31 | 60.8 | 76 | 57.6 | 0.905# |
| From €36,153 to €70,000 | 21 | 36.8 | 10 | 33.3 | 29 | 38.7 | 18 | 35.3 | 50 | 37.9 | ||
| From €70,001 to €100,000 | 1 | 1.8 | 0 | 0.0 | 2 | 2.7 | 1 | 2.0 | 3 | 2.3 | ||
| Over € 100.000 | 2 | 3.5 | 1 | 3.3 | 1 | 1.3 | 1 | 2.0 | 3 | 2.3 | ||
| missing | 0 | 0.0 | 0 | 0.0 | 0 | 0.0 | 0 | 0.0 | 0 | 0.0 | ||
| Antenatal course | Yes | 42 | 73.7 | 21 | 70.0 | 59 | 78.7 | 41 | 80.4 | 101 | 76.5 | 0.414* |
| No | 15 | 26.3 | 9 | 30.0 | 15 | 20.0 | 9 | 17.6 | 30 | 22.7 | ||
| missing | 0 | 0.0 | 0 | 0.0 | 1 | 1.3 | 1 | 2.0 | 1 | 0.8 | ||
| Other children | 0 | 30 | 52.6 | 18 | 60.0 | 36 | 48.0 | 26 | 51.0 | 66 | 50.0 | 0.676# |
| 1 | 20 | 35.1 | 8 | 26.7 | 29 | 38.7 | 20 | 39.2 | 49 | 37.1 | ||
| 2 | 4 | 7.0 | 1 | 3.3 | 6 | 8.0 | 2 | 3.9 | 10 | 7.6 | ||
| 3 | 0 | 0.0 | 0 | 0.0 | 2 | 2.7 | 1 | 2.0 | 2 | 1.5 | ||
| > 3 | 1 | 1.8 | 1 | 3.3 | 0 | 0.0 | 0 | 0.0 | 1 | 0.8 | ||
| missing | 2 | 3.5 | 2 | 6.7 | 2 | 2.7 | 2 | 3.9 | 4 | 3.0 | ||
| Smoking habit during pregnancy | Yes | 4 | 7.0 | 1 | 3.3 | 2 | 2.7 | 2 | 3.9 | 6 | 4.5 | 0.404# |
| No | 52 | 91.2 | 29 | 96.7 | 69 | 92.0 | 48 | 94.1 | 121 | 91.7 | ||
| missing | 1 | 1.8 | 0 | 0.0 | 4 | 5.3 | 1 | 2.0 | 5 | 3.8 | ||
| Mother a smoker? | Yes | 5 | 8.8 | 1 | 3.3 | 8 | 10.7 | 5 | 9.8 | 13 | 9.8 | 0.717* |
| No | 52 | 91.2 | 29 | 96.7 | 67 | 89.3 | 46 | 90.2 | 119 | 90.2 | ||
| missing | 0 | 0.0 | 0 | 0.0 | 0 | 0.0 | 0 | 0.0 | 0 | 0.0 | ||
| Father a smoker? | Yes | 17 | 29.8 | 6 | 20.0 | 20 | 26.7 | 15 | 29.4 | 37 | 28.0 | 0.664* |
| No | 38 | 66.7 | 23 | 76.7 | 53 | 70.7 | 35 | 68.6 | 91 | 68.9 | ||
| missing | 2 | 3.5 | 1 | 3.3 | 2 | 2.7 | 1 | 2.0 | 4 | 3.0 | ||
| Total | 57 | 100.0 | 30 | 100.0 | 75 | 100.0 | 51 | 100.0 | 132 | 100.0 |
- chi-square test(*) or Fisher’s exact test (#) or t-test (+) – Newsletter group vs control group, all regardless of the length of follow-up