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Table 1 Characteristics of the study population when the child is 6 months

From: Association between colic and sleep problems in infancy and subsequent development, emotional and behavioral problems: a longitudinal study

 

n (%)

mean (SD)

Median (range)

Child (N= 86,724) mean (SD)

Male n (%)

40, 205 (51.0)

  

Missing (n= 7947)

   

Gestation age

 ≥37 weeks

70,815 (95.0)

  

 32–36 weeks

3231 (4.3)

  

 28–31 weeks

309 (0.4)

  

  <  28 weeks

192 (0.3)

  

Missing (n= 12,177)

   

Birth weight in grams

78,816

 

3600 (500, 5960)

Missing (n = 7908)

   

Mother (N= 86,724)

Maternal age

82,377

29.8 (4.5)

 

Missing (n = 4387)

   

Maternal education a

 low

26,607 (34.0)

  

 medium

32,941 (42.0)

  

 high

18,836 (24.0)

  

Missing (n = 8340)

   

Work status b

   

 Education

4930 (6.0)

  

 Employed

68,153 (83.1)

  

 Other

8938 (10.9)

  

Missing (n = 4703)

   

Civil status c

 Married/co-habiting

80,333 (97.9)

  

Missing (n = 4640)

   
  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 Work Status at 16–20 weeks of pregnancy: education = student, at home, trainee, military service. Employed = employed in the public or private sector. Other = unemployed
  3. c Civil status at 16–20 weeks of pregnancy
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BMC Pediatrics

ISSN: 1471-2431

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