Table 3 Agreement between recent rheumatoid factor lab test and M05 diagnosis code according to interval of time since testing occurred
RISE | MarketScan | |||
|---|---|---|---|---|
Days between RF lab test and M05 diagnosis code for RA | N | Kappa | N | Kappa |
0 (i.e., same day) | 1375 | 0.40 (0.35, 0.45) | 81 | 0.31 (0.11, 0.51) |
1–7 | 691 | 0.49 (0.42, 0.55) | 72 | 0.44 (0.25, 0.64) |
8–30 | 3850 | 0.51 (0.48, 0.54) | 246 | 0.46 (0.35, 0.57) |
31–180 | 13,781 | 0.59 (0.27, 0.60) | 847 | 0.43 (0.37, 0.49) |
181–365 | 6152 | 0.64 (0.62, 0.66) | 267 | 0.51 (0.41, 0.62) |