. Author manuscript; available in PMC: 2021 May 1.

Published in final edited form as: J Pain. 2019 Sep 14;21(5-6):546–556. doi: 10.1016/j.jpain.2019.09.001

Table 2.

Descriptive statistics and bi-variate within-person correlations of study variables

Variables	1	2	3	4
1. Previous night non-restorative sleep	–	.18^**	.06^*	.17^**
2. Morning pain catastrophizing		–	.48^**	.28^**
3. Afternoon pain severity			–	.28^**
4. End-of-day activity interference				–

Mean	51.37	2.12	50.22	2.00
SD	23.50	1.16	24.27	.63
Observed Range	0–100	1–5	0–100	1–3
ICC	.30	.45	.51	.37

Note.

p < .01,

^**

p < .001