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Table 1 Baseline descriptive characteristics of the study participants

From: Longitudinal validity of using digital hand photographs for assessing hand osteoarthritis progression over 7 years in community-dwelling older adults with hand pain

Baseline Characteristic All eligible baseline participants (n = 558) Participants without repeat digital hand photos at 7 years (n = 305) Participants with repeat digital hand photos at 7 years (n = 253)
% Female (no.) 61.6 (344) 62.6 (191) 60.5 (153)
Age range, years 51–91 51–91 51 to 80
Mean age, years (s.d.) 64.2 (8.2) 65.4 (8.8) 62.7 (7.0)
Mean BMI (s.d.) 28.2 (4.8) 28.7 (4.9) 27.7 (4.6)
% Attended further education (no.) 16.2 (89) 13.1 (39) 19.8 (50)
% Manual occupational class (no.) 52.3 (274) 57.2 (162) 46.7 (112)
% Right-handed (no.) 90.8 (504) 89.8 (274) 90.9 (230)
% Hand pain or problems in the last month (no.) 85.8 (479) 87.5 (267) 83.8 (212)
% Thumb pain during activity in the last month % (no.) 53.0 (296) 56.4 (172) 49.0 (124)
Duration of hand symptoms % (no.):
  < 1 year 10.3 (53) 10.3 (29) 10.2 (24)
 1–5 years 42.3 (218) 41.8 (118) 42.4 (100)
  > 5–10 years 22.5 (116) 21.3 (60) 23.7 (56)
  > 10 years 24.9 (128) 25.5 (72) 23.7 (56)
Summed photographic hand OA score for the 3 joint groups % (no.):
 0 42.6 (229) 38.2 (112) 48.0 (117)
 1 18.8 (101) 19.8 (58) 17.6 (43)
 2 15.1 (81) 14.0 (41) 16.4 (40)
 3 8.9 (48) 9.9 (29) 7.8 (19)
  ≥ 4 14.5 (78) 18.1 (53) 10.2 (25)
Clinical hand OA % (no.):
 ACR criteria 29.6 (165) 29.8 (91) 29.4 (74)
 Relaxed ACR criteria* 51.0 (284) 51.8 (158) 50.0 (126)
Radiographic OA % (no.):
 KL ≥ 2 in ≥1 joint 76.5 (427) 78.4 (239) 74.3 (188)
 KL ≥ 3 in ≥1 joint 35.8 (200) 40.3 (123) 30.4 (77)
  1. * Relaxed ACR criteria is when there is pain on some, most or all days rather than most days or all days in the ACR criteria. s.d., standard deviation; BMI, Body mass Index; ACR, American College of Rheumatology; KL, Kellgren and Lawrence grading system