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Table 3 Hierarchical multiple regression analyses predicting Power Doppler determined (PD) synovitis score by calprotectin and C-reactive protein (CRP)

From: Serum calprotectin (S100A8/9): an independent predictor of ultrasound synovitis in patients with rheumatoid arthritis

  Δ R 2 b (Standard error) Std. b P
Step 1 0.757    0.000
Calprotectin   0.001 (0.00) 0.870 0.000
Step 2 0.765    0.576
Calprotectin   0.001 (0.00) 0.870 0.000
Sex   0.491 (0.67) 0.068 0.471
Age   0.019 (0.02) 0.091 0.331
Step 1 0.495    0.000
CRP   0.215 (0.04) 0.704 0.000
Step 2 0.496    0.989
CRP   0.215 (0.04) 0.701 0.000
Sex   0.022 (1.07) 0.003 0.984
Age   −0.004 (0.03) −0.018 0.898
  1. Note: sex was coded as 0 = males and 1 = females. Std. standardised