Table 4.

Relationship of physical activity and sleep quality to quality of life^a

Variables	Quality of life scale
	Physical health		Mental health
	Rb	P-value	Rb	P-value
Physical activity (PAL)	0.181	0.019	0.288	0.003
Vitamin D3	0.148	.062	−0.020	0.805
Vitamin D2	−0.151	0.055	−0.082	0.301
Daily hours spent outdoors	0.122	0.177	0.273	0.000
Sleep quality (PSQI)c	−0.371	0.000	−0.442	0.000
Average sleep time	−0.327	0.000	−0.265	0.004

Notes: Significance threshold: P<.05.

^aSF-36 physical health and mental health summary scale.

^bPearson’s correlation coefficient.

^cSmaller value indicates better sleep quality.

Abbreviations: PSQI, Pittsburgh Sleep Quality Index.