Table 1 Participant characteristics by baseline pain and insomnia status

Group size

p < 0.001

(%)

1181 (100%)

239 (20.2%)

531 (45.0%)

62 (5.2%)

349 (30.0%)

Age^K

p = 0.015

Median (IQR)

49.6 (± 15.2)

49.4 (±15.3)

48.3 (±14.8)

52. 1 (±15.0)

51.4 (±15.8)

Gender^C

p = 0.003

Female No. (%)

658 (55.7%)

122 (51.0%)

277 (52.2%)

41 (66.1%)

218 (62.5%)

Occupation^C

Manual (%)

p = 0.903

Delayed sleep onset^C

Restricted No. (%)

122

(10.3%)

-

-

18

(29.0%)

104

(29.8%)

Difficulty maintaining sleep^C

Restricted No. (%)

298

(25.2%)

-

-

48

(77.4)

250

(71.6%)

p = 0.347

Early waking^C

Restricted No. (%)

188

(15.9%)

-

-

33

(53.2%)

155

(44.4%)

p = 0.199

Non-restorative sleep^C

Restricted No. (%)

215

(18.2%)

-

-

26

(41.9%)

189

(54.2%)

p = 0.076

Baseline RSA^C

Restricted No. (%)

203

(17.2%)

11

(4.6%)

53

(10.0%)

10

(16.1%)

129 (37.0%)

p < 0.001

Baseline SF-12 physical function^A

Median PCS score. (IQR)

48.5

(± 10.5)

54.3

(±4.7)

49.4

(±8.9)

51.2

(±10.0)

42.5

(±12.6)

p < 0.001

Baseline Anxiety^C

Possible/probable No. (%)

460

(39.0%)

38

(15.9%)

159

(29.9%)

27

(43.5%)

236

(67.6%)

p < 0.001

Baseline Depression^C

Possible/probable No. (%)

206

(17.4%)

38

(5.4%)

45

(8.5%)

15

(24.2%)

133

(38.1%)

p < 0.001

12 month review RSA^C

Restricted No. (%)

200

(16.9%)

12

(5.0%)

62

(11.7%)

17

(27.4%)

109

(31.2%)

p < 0.001