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Table 1 Baseline characteristics of infants and their families. Results presented as absolute figures (percentages of total) or mean values (SD). Missing values comprised maximum 1% and were collapsed with no category

From: The effect of chiropractic care on infantile colic: results from a single-blind randomised controlled trial

  All
N = 185 (100 %)
Treatment group
N = 96
Control group
N = 89
Male 90 (48.6) 40 (41.7) 50 (56.2)
Female 95 (51.4) 56 (58.3) 39 (43.8)
Birth Weight (g) 3438 (583) 3452 (630) 3422 (529)
Birth length (cm) 51 (2.4) 51 (2.6) 51 (2.2)
Gestational age at birth (weeks) 39.5 (1.7) 39.5 (1.7) 39.5 (1.7)
Weight at study (g) 4742 (838) 4787 (874) 4694 (798)
Age at onset of colic (days) 13.1 (10.7) 13.1 (11.5) 13.2 (9.7)
Age at inclusion (weeks) 6.7 (2.8) 6.8 (2.9) 6.6 (2.6)
Age categories at inclusion (weeks)
 2-6 91 (49.2) 48 (50.0) 43 (48.3)
 7-10 77 (41.6) 37 (38.5) 40 (44.9)
 11-14 17 (9.2) 11 (11.5) 6 (6.7)
Feeding mode
 Breast-fed 104 (56.2) 52 (54.2) 52 (58.4)
 Bottle-fed 51 (27.6) 28 (29.2) 23 (25.8)
 Breast and bottle-fed 30 (16.2) 16 (16.7) 14 (15.7)
Birth
 Normal vaginal delivery 132 (71.4) 64 (66.7) 68 (76.4)
 Vacuum-assisted delivery 8 (4.3) 5 (5.2) 3 (3.4)
 Caesarean, planned 21 (11.4) 15 (15.6) 7 (7.9)
 Caesarean, acute 24 (13.0) 13 (13.5) 11(12.4)
Siblings (yes) 105 (56.8) 56 (58.3) 49 (55.1)
Siblings with colic (yes) 35 (18.9) 16 (16.7) 19 (21.3)
Health of mother
 Physical or mental illness (yes) 48 (25.9) 26 (27.1) 22 (24.7)
Severe incidenta in the family during pregnancy (yes) 50 (27.0) 31 (32.3) 19 (21.3)
Severe incidenta in the family after birth (yes) 32 (17.3) 16 (16.7) 16 (18.0)
Educational level, mother
 Primary school 11 (5.9) 6 (6.3) 5 (5.6)
 Upper secondary school 7 (3.8) 4 (4.2) 3 (3.4)
 Skilled 21 (11.4) 18 (18.3) 3 (3.4)
 Short academic education (2-2.5 years) 26 (14.1) 14 (14.6) 12 (13.5)
 Medium academic education (3.5-4 years) 62 (33.5) 26 (27.1) 36 (40.4)
 Long academic education (>5 years) 34 (18.4) 19 (19.8) 15 (16.9)
 Undergoing education 24 (13.1) 9 (9.4) 15 (16.9)
Cohabitation status
 Cohabiting/married 172 (93.0) 89 (92.7) 83 (93.3)
 Living alone 13 (7.0) 7 (7.3) 6 (6.7)
  1. adeath in family/among close friends, serious illness, unemployment, bankruptcy or similar