Table 3.

Correlation between Pain Recorder and questionnaire scores for assessing construct validity

Pair of variable	Spearman’s correlation coefficient (r)	P value
1. Baseline questionnaire pain intensity & Pain Recorder pain intensity first 1–3 a days (n = 20)	0.79	< 0.0001
2. Baseline questionnaire pain interference & Pain Recorder pain interference first 1–3 a days (n = 20)	0.60	0.005
3. Baseline questionnaire mood & Pain Recorder mood first 1–3 a days (n = 20)	0.27	0.27
4. Baseline questionnaire “staying asleep” & Pain Recorder “staying asleep” first 1–3 a days (n = 14)	0.22	0.45
5. Follow-up questionnaire pain intensity & Pain Recorder pain intensity last 1–3 a days (n = 18)	0.92	< 0.0001
6. Follow-up questionnaire pain interference & Pain Recorder pain interference last 1–3 a days (n = 18)	0.40	0.11
7. Follow-up questionnaire mood & Pain Recorder mood last 1–3 a days (n = 18)	0.15	0.56
8. Follow-up questionnaire “staying asleep” & Pain Recorder “staying asleep” last 1–3 a days (n = 15)	0.53	0.04

^aAveraged score or category