Background
Methods
Patients
Anti-CCP2, RF, and anti-CarP measurements
Analyses
Results
Total group of UA patients | Subgroup of 1987 UA patients | Subgroup of 2010 UA patients | |
---|---|---|---|
(n = 1430) | (n = 1352) | (n = 838) | |
Age (years), mean (SD) | 53 (17) | 53 (17) | 51 (17) |
Female, n (%) | 882 (62) | 837 (62) | 494 (59) |
Symptom duration (weeks), median (IQR) | 14 (6-31) | 14 (6-31) | 12 (5-28) |
66-SJC, median (IQR) | 3 (1-7) | 3 (1-7) | 2 (1-4) |
68-TJC, median (IQR) | 4 (1-10) | 4 (1-10) | 2 (1-5) |
CRP (mg/ml), median (IQR) | 8 (3-22) | 8 (3-22) | 6 (3-19) |
ACPA positivity, n (%) | 297 (21) | 283 (21) | 48 (6) |
RF positivity, n (%) | 374 (26) | 359 (27) | 68 (8) |
anti-CarP positivity, n (%) | 271 (19) | 257 (19) | 77 (9) |
RA | No RA | % RA/% non-RA development (pre-test risks)a | OR (95% CI) | PPV (95% CI) | NPV (95% CI) | ||
---|---|---|---|---|---|---|---|
1987-UA patients (n = 1352) | |||||||
ACPA–RF– (n = 929) | anti-CarP+ | 23 | 42 | 21/79 | 2.1 (1.3–3.7) | 35 (25–48) | 80 (77–82) |
anti-CarP– | 176 | 688 | |||||
ACPA+RF– (n = 64) | anti-CarP+ | 16 | 10 | 50/50 | 2.2 (0.8–6.1) | 62 (43–78) | 58 (42–72) |
anti-CarP– | 16 | 22 | |||||
ACPA–RF+ (n = 140) | anti-CarP+ | 8 | 9 | 39/61 | 1.4 (0.5–4.0) | 47 (26–69) | 62 (53–70) |
anti-CarP– | 47 | 76 | |||||
ACPA+RF+ (n = 219) | anti-CarP+ | 107 | 42 | 71/29 | 1.2 (0.6–2.2) | 72 (64–78) | 31 (22–43) |
anti-CarP– | 48 | 22 | |||||
2010-UA patients (n = 838) | |||||||
ACPA–RF– (n = 755) | anti-CarP+ | 1 | 48 | 4/96 | 0.5 (0.1–3.5) | 2 (0–11) | 96 (94–97) |
anti-CarP– | 30 | 676 | |||||
ACPA+RF– (n = 15) | anti-CarP+ | 1 | 2 | 13/87 | 5.5 (0.2–129) | 33 (6–79) | 92 (65–99) |
anti-CarP– | 1 | 11 | |||||
ACPA–RF+ (n = 35) | anti-CarP+ | 0 | 4 | 17/83 | Undefined | 0 (0–49) | 81 (64–91) |
anti-CarP– | 6 | 25 | |||||
ACPA+RF+ (n = 33) | anti-CarP+ | 9 | 12 | 42/58 | 1.1 (0.2–4.4) | 43 (24–63) | 58 (32–81) |
anti-CarP– | 5 | 7 |