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Table 1 Baseline characteristics of participants by study groups

From: Traditional Mongolian swaddling and developmental dysplasia of the hip: a randomized controlled trial

Characteristics Non-swaddling
N = 40
n(%)
Swaddling
N = 40
n(%)
P
Mean age in days at screening (mean ± SD) 1.1 ± 0.14 1.0 ± 0.13 0.53
Girlsa 32(80.0) 34(85.0) 0.56
Breech positionb 1(2.5) 1(2.5) 0.75
Family history of DDHb 1(2.5) 3(7.5) 0.31
Birth weight > 4000grb 5(12.5) 4(10.0) 0.72
Firstborn babya 9(22.5) 4(10.0) 0.13
Mean of Graf’s hip alpha angle at initial screening (mean ± SD)c
 Right hip 57.8 ± 4.1 56.7 ± 3.4 0.18
 Left hip 56.6 ± 3.8 55.4 ± 3.9 0.19
  1. a Chi-square test, b Fishier exact test, c t test; SD Standard deviation, DDH Developmental Dysplasia of the Hip