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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  
  1. a Education at 16–20 weeks of pregnancy: low education = completed elementary school and or high school. Medium education = completed college/university 1–3 years. High education = completed college/university ≥4 years
  2. b Experience of birth – "I felt safe and in good hands"