Table 4

Clinical examination features and their association with hand OA and discriminatory capacity

OR (95% CI)AUC (95% CI)*
Number of joints with bony enlargement:

  • DIP joints

1.33 (1.18–1.51)0.71 (0.64–0.78)

  • PIP joints

1.22 (1.08–1.38)0.64 (0.56–0.72)

  • MCP joints

1.02 (0.71–1.48)0.51 (0.42–0.59)

  • Thumb base joints

1.96 (1.20–3.19)0.59 (0.51–0.67)
Number of joints with pain on pressure:

  • DIP joints

1.24 (1.08–1.43)0.64 (0.56–0.72)

  • PIP joints

1.02 (0.92–1.12)0.53 (0.44–0.61)

  • MCP joints

0.81 (0.71–0.93)0.62 (0.54–0.70)

  • Thumb base joints

1.51 (1.03–2.22)0.59 (0.50–0.67)
Number of joints with soft tissue swelling:

  • DIP joints

1.17 (0.91–1.52)0.55 (0.47–0.63)

  • PIP joints

1.00 (0.86–1.17)0.53 (0.45–0.61)

  • MCP joints

0.48 (0.32–0.73)0.66 (0.57–0.74)

  • Thumb base joints

0.83 (0.32–2.16)0.51 (0.42–0.59)
Number of joints with malalignment:

  • DIP joints

4.09 (1.88–8.87)0.68 (0.60–0.75)

  • PIP joints

1.75 (1.01–3.04)0.57 (0.48–0.65)

  • Thumb base joints

3.28 (1.00–10.72)0.55 (0.47–0.63)
Pain on palpation in wrist(s)0.42 (0.22–0.82)0.58 (0.50–0.67)

  • *Interpretation of AUC values: 0.50–0.59 = no discrimination, 0.60–0.69 = poor discrimination, 0.70–0.79 = acceptable discrimination, and ≥0.80 = excellent discrimination.

  • AUC, area under receiver operating curves; DIP, distal interphalangeal; MCP, metacarpophalangeal; OA, osteoarthritis; PIP, proximal interphalangeal.