Table 6.

Pearson's correlation test between survey time and user variables.

		Survey time	Mood	Sleep	Pain	Pain level
Survey time	Pearson's correlation	1	−0.049	0.007	0.335∗∗	0.323∗∗
	Sig. (2-tailed)		0.272	0.874	0.000	0.000
	N	497	497	497	497	497
Mood	Pearson's correlation	−0.049	1	−0.133∗∗	−0.158∗∗	−0.335∗∗
	Sig. (2-tailed)	0.272		0.003	0.000	0.000
	N	497	497	497	497	497
Sleep	Pearson's correlation	0.007	−0.133∗∗	1	0.121∗∗	0.125∗∗
	Sig. (2-tailed)	0.874	0.003		0.007	0.005
	N	497	497	497	497	497
Pain	Pearson's correlation	0.335∗∗	−0.158∗∗	0.121∗∗	1	0.703∗∗
	Sig. (2-tailed)	0.000	0.000	0.007		0.000
	N	497	497	497	497	497
Pain level	Pearson's correlation	0.323∗∗	−0.335∗∗	0.125∗∗	0.703∗∗	1
	Sig. (2-tailed)	0.000	0.000	0.005	0.000
	N	497	497	497	497	497

^∗∗Correlation is significant at the 0.01 level (2-tailed).