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Table 3 Socio-demographic characteristics of the current study population and eight other Dutch shoulder research study populations

From: High prevalence of shoulder girdle muscles with myofascial trigger points in patients with shoulder pain

  Current study N = 72 Van der Windt 1996 N = 335 De Winter 1999 N = 201 Winters 1999 N = 101 Bot 2005 N = 281 Bergman 2005 N = 71 Kuijpers 2006 N = 492 Feleus 2008 N = 682 Reilingh 2008 N = 587
Age (years,± SD)         
  43 (12.3) 49.6 (14.4) 48 (12) 47.3 (15.4) 49.2 (13.8) 47.8 (11.8) 52 (14) 45* 49.5 (14.7)† 51.9 (13.9)‡ 52.9 (13.3)¶
Gender (%)         
female 69 56 66 58 63 52 50 52 50
Education level         
Low 6 NA NA NA 44 NA NA 36 36
Medium 47 NA NA NA 42 NA NA 36 41
High 47 NA NA NA 14 NA NA 28 23
Duration of shoulder pain (month)       
< 3 m 0 85 26 75 66 70 60 74 59
3-6 m    16    30 40   41
> 6 m 100 15 55 25 34   26   
  1. *Feleus reported the median instead of the mean age
  2. †Mean age (±SD) of the acute pain group (< 6 weeks)
  3. ‡Mean age (±SD) of the subacute pain group (6-12 weeks)
  4. ¶Mean age (±SD) of the chronic pain group (> 3 months)
  5. NA (not available). It was not possible to derive these data from the papers.