Table 3.

Multiple logistic regression of probability of using the mobile smartphone (OR, 95% CI) with physical activity, sleep disturbance, and mood state.

	Predictor	X2	p	Odds Ratio	95% Confidence Interval
					Lower	Upper	p
Smartphone Use	Low Physical Activity	40.9	<0.001	2.981	1.325	7.847	0.027
	Sitting time	30.5	<0.001	1.544	0.758	3.163	0.232
	POMS_Vigor	45.2	<0.001	1.115	0.399	3.112	0.835
	POMS_Fatigue	45.0	<0.001	1.644	0.610	4.436	0.326
	POMS_Tension	41.3	<0.001	2.161	0.822	5.681	0.118
	POMS_Depression	46.9	<0.001	2.400	0.948	6.077	0.065
	POMS_Anger	45.5	<0.001	3.948	1.450	10.752	0.007
	POMS_Confusion	48.1	<0.001	2.756	1.123	6.761	0.027
	Poor sleep quality	39.3	<0.001	2.679	1.126	6.377	0.026

OR: Odd ratio adjusted for age and sex; CI, confidence interval. Low physical activity is defined as not meeting WHO physical activity guidelines: accumulating 150 min/week of moderate physical activity or 75 min/week of vigorous physical activity or equivalent combination of moderate and vigorous physical activity. High scores in sitting time are defined as quartile 4, representing the group with the highest times. High scores in the POMS subscales are defined as quartile 4, representing the group with the highest scores. Poor sleep quality is defined as Pittsburgh Sleep Quality Index (PSQI) global score >5. Bold values denote statistical significance at the p < 0.05 level.