Table 5.

Spearman correlation coefficients between perceived acute sleep–pain relationship and habitual insomnia/pain severity (N = 2,873; brackets indicate 95% bootstrap confidence intervals).

	Sleep→Pain		Pain→Sleep
	Pain after worse sleepa	Pain after better sleepa	Sleep after more painb	Sleep after less painb
ISI	0.19*** [0.16, 0.23]	−0.13*** [−0.17, −0.10]	−0.20*** [−0.23, −0.16]	−0.02 [−0.05, 0.02]
CPG pain intensity	0.19*** [0.15, 0.22]	−0.06** [−0.10, −0.02]	−0.26*** [−0.30, −0.22]	0.10*** [0.06, 0.14]

CPG, Chronic Pain Grade; ISI, Insomnia Severity Index.

^**p < 0.01,

^***p < 0.001.

^aResponses to the items “If I sleep worse/better than usual on one night, the next day the chance of feeling pain is …” with ratings ranging from −3 (much smaller) to 3 (much bigger).

^bResponses to the items “If I have a day with more/less pain than usual, the following night I usually sleep …” with ratings ranging from −3 (much worse) to 3 (much better).