Table 1 Some characteristics of infants with (11.6%) and without (88.4%) a history of colic and their mothers when the child is 6 months, including gender, gestation age, birthweight, patterns of sleep, fussiness (temperament), the mothers´ age, education, and experience at birth. (N = 88,186; missing = 3433; analysed = 84,753)
From: Infant colic, young children’s temperament and sleep in a population based longitudinal cohort study
Colic n = 9794 11.6% | Not colic n = 74,959 88.4% | ||||
|---|---|---|---|---|---|
Mean | SD | Mean | SD | P-value | |
Birth weight (gr) | 3507.5 | 586.1 | 3593.8 | 571.0 | < 0.001 |
Birth length (cm) | 50.0 | 2.54 | 50.4 | 2.47 | < 0.001 |
Mother’s age | 29.6 | 4.7 | 29.8 | 4.5 | < 0.001 |
ICQ - temperament/fussiness | 3.69 | 0.48 | 3.87 | 0.44 | < 0.001 |
n | % | n | % | ||
Gender | < 0.001 | ||||
• Boy | 4718 | 52.9 | 34,915 | 50.8 | |
• Girl | 4196 | 47.1 | 33,866 | 49.2 | |
• missing | 880 | 9.0 | 6178 | 8.3 | |
Mothers’ education a | < 0.001 | ||||
• low | 3329 | 34.0 | 23,717 | 31.6 | |
• medium | 3758 | 38.4 | 29,785 | 39.7 | |
• high | 2090 | 21.3 | 17,069 | 22.8 | |
• missing | 617 | 6.3 | 4388 | 5.9 | |
Pregnancy duration | < 0.001 | ||||
• normal ≥37 weeks | 7971 | 92.6 | 62,811 | 94.6 | |
• born too early | 640 | 7.4 | 3599 | 5.4 | |
• missing | 1182 | 12.1 | 8549 | 11.4 | |
Safe delivery – mothers’ experience b | < 0.001 | ||||
• positive experience | 7615 | 80.3 | 62,248 | 85.2 | |
• negative | 1871 | 19.7 | 10,845 | 14.8 | |
• missing | 308 | 3.1 | 1866 | 2.5 | |
Breastfeeding now | < 0.001 | ||||
• sometimes or never | 2240 | 23.3 | 14,340 | 19.4 | |
• daily | 7378 | 76.7 | 59,587 | 80.6 | |
• missing | 176 | 1.8 | 1032 | 1.4 | |
Exclusive breastfeeding (0–3 months) | < 0.001 | ||||
• yes | 5407 | 55.2 | 46,359 | 61.8 | |
• no | 4387 | 44.8 | 28,600 | 38.2 | |
Child Health Centre (number of visits) | < 0.001 | ||||
• 3–5 visits | 3544 | 40.2 | 31,370 | 46.2 | |
• 6–10 visits | 4275 | 48.5 | 31,309 | 46.2 | |
• more than 10 visits | 987 | 10.1 | 5152 | 6.9 | |
• missing | 988 | 10.1 | 7128 | 9.5 | |
Total hours of sleep at 6 months | < 0.001 | ||||
• less than 13 h | 517 | 5.4 | 2199 | 3.0 | |
• 13 h or more | 9067 | 94.6 | 71,246 | 97.0 | |
• missing | 210 | 2.1 | 1514 | 2.0 | |
Easy to put to bed | < 0.001 | ||||
• easy | 5925 | 71.3 | 55,588 | 85.1 | |
• not easy | 2381 | 28.7 | 9728 | 14.9 | |
• missing | 1488 | 15.2 | 9643 | 12.9 | |
Night awakenings | < 0.001 | ||||
• usual (2 times or less) | 2147 | 24.2 | 20,974 | 30.6 | |
• more than usual (3 times or more) | 6723 | 75.8 | 47,606 | 69.4 | |
• missing | 924 | 9.4 | 6379 | 8.5 | |