Table 3:

Multivariate analysis of snoring and asthma morbidity

	How often does your child snore?
	No snoring N=363 (177 subjects)	Rare snoring N=319 (190 subjects)	Sometimes snoring N=239 (148 subjects)	Habitual snoring N=265 (128 subjects)
Health Outcomes
Maximum Symptom days	Reference group	OR=0.98 (0.75,1.27) p=0.87	OR=1.01 (0.77, 1.33) p=0.92	OR=1.58 (1.19,2.10) P=0.002ab
Healthcare use	Reference group	IRR=1.17 (0.74,1.84) p=0.49	IRR=1.18 (0.72,1.92) p=0.52	IRR=1.72 (1.10,2.69) p=0.02
School absences	Reference group	IRR=1.12 (0.78,1.61) p=0.54	IRR=1.24 (0.82,1.88) p=0.31	IRR=1.28 (0.84,1.93) p=0.25
Missed sleep	Reference group	OR=1.45 (1.01,2.08) p=0.04	OR=1.69 (1.07,2.66) p=0.02	OR=2.35 (1.55,3.56) p<0.001c
Changed plans	Reference group	OR=1.48 (0.91,2.40) p=0.11	OR=1.47 (0.79,2.72) p=0.22	OR=2.63 (1.50,4.62) p=0.001de
Composite asthma control	Reference group	OR=1.24 (0.91,1.69) p=0.17	OR=1.29 (0.93,1.80) p=0.13	OR=1.49 (1.05,2.11) p=0.03

IRR=incidence rate ratio, OR=odds ratio, p=p-value

^asignificantly different than Rare snoring (OR=1.62 [1.20,2.17], p=0.001)

^bsignificantly different than Sometimes snoring (OR=1.56 [1.17,2.07], p=0.002)

^csignificantly different than Rare snoring (OR=1.62 [1.10,2.39], p=0.02)

^dsignificantly different than Rare snoring (OR=1.78 [1.06,2.98], p=0.03)

^esignificantly different than Sometimes snoring (OR=1.79 [1.04,3.09], p=0.04)All results adjusting for BMI category, income, nasal symptoms with a cold/flu, and nasal symptoms without a cold/flu

Primary outcome: Maximum asthma symptom days were determined by the largest value among the following three variables in the 14 days prior to each survey: (a) number of days with wheezing, chest tightness, or cough, (b) number of days on which child had to slow down or stop his/her play or activities due to wheezing, chest tightness, or cough, and (c) number of nights the participant woke up because of wheezing, chest tightness, or cough leading to disturbed sleep. The outcome is a score from 0–14 days.

Secondary outcomes: Healthcare use was defined as number of hospitalizations and unscheduled health care visits; school absences and changed plans were defined as number of days of missed school or change in caregiver plans; missed sleep was defined as number of nights caregiver lost sleep because of child’s asthma; a composite outcome of poor asthma control over the prior 4 weeks was defined by any of the following: shortness of breath more than twice weekly, nighttime awakenings owing to asthma at least once, limitation in activity level, or use of rescue asthma medication 2 or more times weekly.