Table 2.

Association between BMI Z-Score, Age, and Demographic and Sleep Variables (n=190)

Demographic/Sleep variable	Age	BMI z-score
Age (years)	−0.09
BMI z-score	0.09	-
Socioeconomic status	−0.04	0.01
Parental snoringa	0.01	−0.02
Smoking in homea	0.10	0.04
Total sleep time (min)	−0.04***	−0.09
Stage 1%	0.11	0.09
Stage 2%	0.30****	−0.01
SWS%	−0.15*	−0.11
REM%	−0.30****	−0.11
REM latency (min)	0.16*	−0.02
(OAHI	−0.09	0.24***)
OAHI-transformed	0.04	−0.21**
(CAI	−0.04	0.16*)
CAI-transformed	0.19**	−0.18*
Spontaneous Arousals Index	−0.10	0.03
Respiratory Arousals Index	−0.03	0.19*
SpO2 nadir	0.14	−0.17*

NB *denotes p < 0.05, **p < 0.01, ***p < 0.005 and ****p < 0.001. Stage 1, stage 2, SWS (slow wave sleep), and REM sleep are presented as a percentage of total sleep time. Spontaneous and Respiratory Arousals are number of events per hour of total sleep time. ^aSpearman correlation for ordinal data, remaining relationships Pearson-r correlations.