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Table 1 Baseline characteristics of the study population stratified by number of chronic musculoskeletal pain sites

From: The interplay between multisite pain and insomnia on the risk of anxiety and depression: the HUNT study

Variables No chronic pain Number of chronic pain sites
1–2 pain sites 3–4 pain sites ≥5 pain sites
Participants, no. 9380 4161 2865 1895
Age, mean (SD) [range], years 50.2 (13.6) [19–89] 52.9 (12.5) [19–87] 54.4 (11.7) [19–85] 56.2 (10.5) [21–90]
Females, % (no.) 53.4 (5011) 53.6 (2231) 65.9 (1888) 74.1 (1404)
Body mass index, mean (SD), kg/m2 26.6 (4.0) 27.1 (4.1) 27.8 (4.4) 28.3 (4.6)
Inactive, % (no.)a 16.1 (1.514) 17.8 (740) 17.4 (500) 18.9 (358)
Insomnia, % (no.)b 2.4 (230) 3.5 (146) 7.1 (205) 11.0 (210)
Current smoker, % (no.) 10.8 (1.011) 13.1 (544) 15.5 (444) 19.0 (360)
Possible alcohol abuse, % (no.)c 6.7 (625) 6.8 (285) 5.9 (168) 5.2 (98)
Comorbid conditions, % (no.)d 14.3 (1344) 25.9 (1078) 37.8 (1082) 58.6 (1110)
 Cardiovascular disease, % (no.) 6.1 (574) 7.4 (307) 8.7 (250) 11.9 (226)
 Diabetes, % (no.) 2.7 (256) 3.0 (125) 3.8 (110) 5.8 (110)
 Rheumatic/degenerative joint disease, % (no.) 4.1 (380) 15.7 (653) 27.4 (784) 46.0 (871)
 Cancer, % (no.) 3.8 (358) 4.6 (190) 5.4 (154) 6.4 (122)
  1. SD standard deviation
  2. aPhysical activity less than once per week; bAt least one nighttime insomnia symptom (‘difficulty falling asleep’, ‘difficulty maintaining sleep’, or ‘waking up too early’) accompanied by daytime sleepiness; cScore ≥ 2 on the CAGE questionnaire; dAny of the following: cardiovascular disease, diabetes, cancer, rheumatic disease, degenerative joint disease