Table 5.

Age-adjusted and Fully Adjusted Odds of Being 0.5 SD Unit Below the Mean on the Gross Motor Scale at 6 and 18 Months for Sleeping Position Compared With Supine Position (With Significance Level of χ2 Test for Improvement in Model Fit When Term Was Added).

Sleeping PositionnAge Adjusted β [95% CI]Fully Adjusteda β [95% CI]
At 6 months
 Back17771.00 Ref1.00 Ref
 Side62351.06 [0.95, 1.19]0.98 [0.87, 1.10]
 Front  3200.71 [0.52, 0.97]0.60 [0.44, 0.82]
 Varies 7740.80 [0.66, 0.97]0.78 [0.64, 0.95]
 χ2 test significance level 5-165   5-165,*   
At 18 months
 Back16111.00 Ref1.00 Ref
 Side58921.17 [0.90, 1.51]1.12 [0.86, 1.45]
 Front 3080.88 [0.72, 1.06]0.86 [0.70, 1.04]
 Varies 7150.95 [0.84, 1.06]0.94 [0.84, 1.07]
 χ2 test significance levelNS  NS   
  • a Adjusted for significant factors from the 27 described in “Methods.” NS indicates nonsignificant;

  • F5-165 P < .001;

  • * P < .0001.