Table 1.

Characteristics of the Study Infants

CharacteristicInfant Massage Group
(n = 28)n (%)
Crib Vibrator Group
(n = 30)n (%)
Gender
 Male  17 (61)  15 (50)
 Female  11 (39)  15 (50)
Feeding type before intervention
 Exclusively breastfed  18 (64)  25 (83)
 Mostly breastfed   7 (25)   3 (10)
 Mostly formula fed   2 (7)   1 (3)
 Exclusively formula fed   1 (4)   1 (3)
First born  16 (57)  20 (67)
Vaginal delivery  26 (93)  26 (87)
Birth weight (g)*3681 (512)3653 (390)
Gestational age (wk)*  40.1 (1.2)  40.0 (1.0)
Age (d)*
 At study entry  31.7 (7.4)  29.5 (8.0)
 At the beginning of intervention  39.5 (7.2)  37.3 (7.7)
Crying at baseline (h/d)*
 Total crying   3.6 (1.4)   4.2 (2.0)
 Colicky crying   2.1 (1.1)   2.9 (1.5)
 Other crying   1.6 (1.1)   1.3 (1.3)
  • * Data are presented as means (SD).

  • P = .021, 2-sample t test for independent samples.