Table 1: Demographic characteristics of the participants.

Mean (SD) or (%)
True Sham

Age 45.4 (21.8) 49.8 (14.4)
Gender
 Male ( )2 (2%)2 (22%)
 Female ( )8 (8%)7 (78%)
Marital status
 Married/partnered ( )5 (50%)5 (56%)
 Divorced/separated/other ( )5 (50%)4 (44%)
Education
 Primary ( )1 (10%)0 (0%)
 Secondary ( )2 (20%)1 (11%)
 College and above ( )7 (50%)8 (89%)
Ethnicity
 White ( )9 (90%)8 (89%)
 Black ( )1 (10%)1 (11%)
Pain medication use at baseline
 Yes2 (20%)4 (44%)
 No8 (80%)5 (56%)