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 |
1 ≥ 4 L88 ICPC-1 codes at a contact and ≥ 2 L88 ICPC-1 codes at a prescription OR ≥ 1 L88 ICPC-1 code at an episode and ≥ 2 L88 ICPC-1 codes at a prescription.