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TABLE 3

Sleep Behaviors and Parenting Practices at 16 wk Among Firstborn (FB) and Secondborn (SB) Siblings Enrolled in the INSIGHT and SIBSIGHT Studies (n = 107 dyads)

Similarity Within FamiliesBirth Order Effect SB Versus FBa
VariablesFB %SB %% AgreementFisher’s Exact Test P valueOR95% CIP value
Bedtime routine duration >15 to ≤45 minb 42 43 64 .009 1.1 0.7–1.8 .71 
Bedtime routine components        
 Read book 45 25 64 .01 0.4 0.2–0.7 <.001 
 Rocking 63 58 73 <.001 0.8 0.5–1.3 .35 
 Bath 61 49 67 <.001 0.6 0.4–0.9 .03 
 Music 19 14 82 .001 0.7 0.4–1.3 .25 
 Watch television 89 1.00 0.2 0.0–0.9 .04 
 Bottle feed or breastfeed 94 94 88 1.00 1.2 0.4–3.8 .78 
 Fed as last activity 35 26 73 <.001 0.7 0.4–1.1 .10 
Sleep location and behaviors 
 Bedtime 8PM or earlier 32 38 69 .001 1.4 0.8–2.3 .23 
 Sleeps in own room 65 51 75 <.001 0.6 0.4–0.8 .004 
 Falls asleep swaddled 28 33 69 .006 1.3 0.7–2.1 .39 
 Falls asleep with pacifier 36 27 71 .001 0.7 0.4–1.1 .11 
 Falls asleep with white noise 30 35 71 <.001 1.2 0.8–2.0 .35 
 Falls asleep being held 45 43 70 <.001 0.9 0.6–1.4 .72 
 Falls asleep alone in room, in crib (self-soothes) 46 37 71 <.001 0.7 0.4–1.1 .11 
 Falls asleep in ≤15 min 63 66 55 .84 1.2 0.7–2.1 .56 
Night waking 
 ≥2 per night 33 41 62 .06 1.4 0.9–2.4 .16 
 ≥2 night feedingsc 31 37 64 .05 1.3 0.8–2.2 .33 
Parenting strategies        
 Give a few minutes to fall back asleep 58 50 67 <.001 0.7 0.5–1.1 .13 
 Pick up and hold or rock back to sleep 34 34 66 .02 1.0 0.6–1.7 1.00 
 Rub or pat but do not pick up 19 20 77 .02 1.1 0.6–1.9 .84 
 Feed back to sleep 65 65 70 <.001 1.0 0.6–1.6 1.00 
 Give pacifier 37 40 69 <.001 1.1 0.7–1.8 .60 
 Change diaper 68 59 61 .10 0.7 0.4–1.1 .12 
Sleep safety 
 Supine position 91 89 91 <.001 0.8 0.4–1.5 .53 
 Unapproved object in crib (eg, blanket, pillow)d 42 29 70 <.001 0.6 0.4–0.9 .02 
Similarity Within FamiliesBirth Order Effect SB Versus FBa
VariablesFB %SB %% AgreementFisher’s Exact Test P valueOR95% CIP value
Bedtime routine duration >15 to ≤45 minb 42 43 64 .009 1.1 0.7–1.8 .71 
Bedtime routine components        
 Read book 45 25 64 .01 0.4 0.2–0.7 <.001 
 Rocking 63 58 73 <.001 0.8 0.5–1.3 .35 
 Bath 61 49 67 <.001 0.6 0.4–0.9 .03 
 Music 19 14 82 .001 0.7 0.4–1.3 .25 
 Watch television 89 1.00 0.2 0.0–0.9 .04 
 Bottle feed or breastfeed 94 94 88 1.00 1.2 0.4–3.8 .78 
 Fed as last activity 35 26 73 <.001 0.7 0.4–1.1 .10 
Sleep location and behaviors 
 Bedtime 8PM or earlier 32 38 69 .001 1.4 0.8–2.3 .23 
 Sleeps in own room 65 51 75 <.001 0.6 0.4–0.8 .004 
 Falls asleep swaddled 28 33 69 .006 1.3 0.7–2.1 .39 
 Falls asleep with pacifier 36 27 71 .001 0.7 0.4–1.1 .11 
 Falls asleep with white noise 30 35 71 <.001 1.2 0.8–2.0 .35 
 Falls asleep being held 45 43 70 <.001 0.9 0.6–1.4 .72 
 Falls asleep alone in room, in crib (self-soothes) 46 37 71 <.001 0.7 0.4–1.1 .11 
 Falls asleep in ≤15 min 63 66 55 .84 1.2 0.7–2.1 .56 
Night waking 
 ≥2 per night 33 41 62 .06 1.4 0.9–2.4 .16 
 ≥2 night feedingsc 31 37 64 .05 1.3 0.8–2.2 .33 
Parenting strategies        
 Give a few minutes to fall back asleep 58 50 67 <.001 0.7 0.5–1.1 .13 
 Pick up and hold or rock back to sleep 34 34 66 .02 1.0 0.6–1.7 1.00 
 Rub or pat but do not pick up 19 20 77 .02 1.1 0.6–1.9 .84 
 Feed back to sleep 65 65 70 <.001 1.0 0.6–1.6 1.00 
 Give pacifier 37 40 69 <.001 1.1 0.7–1.8 .60 
 Change diaper 68 59 61 .10 0.7 0.4–1.1 .12 
Sleep safety 
 Supine position 91 89 91 <.001 0.8 0.4–1.5 .53 
 Unapproved object in crib (eg, blanket, pillow)d 42 29 70 <.001 0.6 0.4–0.9 .02 

Data are presented as % unless otherwise indicated.

a

OR and P value from generalized linear mixed model controlling for study group.

b

n = 106 dyads.

c

n = 105 dyads.

d

n = 103 dyads.

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