Table 1 Number of L88-coded patients in the LINH database who fulfilled combinations of criteria of the algorithm to distinguish IA from non-IA (n=219)
Number of patients (n=219) who fulfilled criteria (%) | Confirmed diagnosis of IA? | ||
|---|---|---|---|
Yes | No | ||
Without using an algorithm | --- | 155 (70.8%) | 64 |
Algorithm based on one criterion: | |||
Criterion 1: Repeat prescription DMARDs/biological agents | 47 (21.5%) | 43 (91.5%) | 4 |
Criterion 2: Contact with GP and IA-related prescription1 | 49 (22.4%) | 44 (89.8%) | 5 |
Criterion 3: Age 30–61 years at first diagnosis | 105 (47.9%) | 80 (76.2%) | 25 |
Algorithm based on two criteria: | |||
Criterion 1 or 2 | 73 (33.3%) | 64 (87.7%) | 9 |
Criterion 1 or 3 | 127 (58.0%) | 101 (79.5%) | 26 |
Criterion 2 or 3 | 132 (60.3%) | 102 (77.3%) | 30 |
Algorithm based on three criteria: | |||
All 3 criteria | 9 (4.1%) | 9 (100%) | 0 |
2 out of 3 criteria | 52 (23.7%) | 49 (94.2%) | 3 |
1 out of 3 criteria | 140 (63.9%) | 109 (77.9%) | 31 |