Table 1.
Description of included children and comparison with excluded children for information collected at the maternity ward, before imputations.
| Included (n = 1130) | Excluded (n = 872) | ||||
|---|---|---|---|---|---|
| % (n) or means (SD) | N Missing | % (n) or means (SD) | N Missing | p value | |
| Maternal characteristics | |||||
| Maternal education (years) | 14.0 (2.6) | 4 | 12.9 (2.7) | 88 | < 10−4 |
| Household income (€/month) | 0 | 83 | < 10−4 | ||
| < 1500 | 11.4% (129) | 25.2% (198) | |||
| 1500–3000 | 58.4% (658) | 52.3% (411) | |||
| > 3000 | 30.2% (340) | 22.5% (177) | |||
| Child characteristics at birth | |||||
| Sex (female) | 47.4% (537) | 0 | 47.5% (366) | 99 | 0.95 |
| Gestational age (weeks) | 39.3 (1.7) | 0 | 39.2 (1.8) | 97 | 0.39 |
| Child characteristics at age 2 | |||||
| Nocturnal sleep duration (h/day) | 11.1 (0.8) | 187 | |||
| < 10h45 | 33.0% (311) | ||||
| 10h45-11h30 | 44.4% (419) | ||||
| > 11h30 | 22.6% (213) | ||||
| Diurnal sleep duration (h/day) | 2.1 (0.5) | 118 | |||
| Bedtime (p.m.) | 08.36 (30 min) | 187 | |||
| Midsleep (a.m.) | 02.06 (36 min) | 187 | |||
| Age (years) | 2.0 (0.1) | 0 | |||
| Child characteristics at age 5 | |||||
| Nocturnal sleep duration (h/day) | 10.8 (0.5) | 13 | |||
| < 10h30 | 15.3% (171) | ||||
| 10h30-11h00 | 60.8% (681) | ||||
| > 11h00 | 23.9% (268) | ||||
| Bedtime (p.m.) | 08.54 (30 min) | 13 | |||
| Midsleep (a.m.) | 02.06 (24 min) | 13 | |||
| Daily outdoors time (hours) | 1.6 (1.0) | 59 | |||
| Daily screen time (hours) | 1.4 (0.9) | 35 | |||
| Age (years) | 5.6 (0.2) | 0 | |||