AFA were present in 62.2% (107/172) of the early RA and 58.8% (127/216) of the late RA. The sensitivity and specificity of AFA in RA were 60.3% and 91.1%. The positive and negative predictive value was 94.6% and 68.0%.

• AFA在早期RA病例中阳性率为62.；2%25；在中晚期RA病例中阳性率为58