Table 4.

Age-adjusted and Fully Adjusted Effects (β) of Sleeping Position in SD Units on Development at 18 Months (With Significance Level of F Test for Improvement in Model Fit When Term Was Added)

Sleeping PositionnAge-adjusted β [95% CI]Fully Adjusteda β [95% CI]
Fine motor
 Back1612 0.00 Ref 0.00 Ref
 Side5892−0.02 [−0.07, 0.04] 0.00 [−0.05, 0.06]
 Front 308−0.03 [−0.15, 0.08]−0.02 [−0.14, 0.09]
 Varies 715−0.01 [−0.10, 0.07]−0.01 [−0.09, 0.07]
 F test significance levelNSNS
Communication
 Back1614 0.00 Ref 0.00 Ref
 Side5898 0.07 [0.02, 0.12] 0.07 [0.01, 0.12]
 Front 308 0.03 [−0.09, 0.15] 0.07 [−0.05, 0.18]
 Varies 714 0.06 [−0.02, 0.15] 0.07 [−0.02, 0.15]
 F test significance levelNSNS
Social skills
 Back1612 0.00 Ref 0.00 Ref
 Side5890 0.03 [−0.02, 0.09] 0.02 [−0.03, 0.08]
 Front 308 0.12 [0.00, 0.24] 0.09 [−0.03, 0.20]
 Varies 715 0.04 [−0.05, 0.12] 0.05 [−0.04, 0.13]
 F test significance levelNSNS
Total score
 Back1609 0.00 Ref 0.00 Ref
 Side5883 0.04 [−0.01, 0.10] 0.04 [−0.01, 0.09]
 Front 308 0.04 [−0.07, 0.16] 0.07 [−0.05, 0.18]
 Varies 714 0.05 [−0.03, 0.14] 0.07 [−0.02, 0.15]
 F test significance levelNSNS
  • a Adjusted for significant factors from the 27 described in “Methods.” NS indicates nonsignificant.