General practice cluster | General practice surgeries n | Average practice list size n | Delay between LTBI test offered and IGRA test done | Delay between IGRA test done and treatment referral | ||||||||
<3 months n (%#) | >3 months n (%#) | Univariable analysis | <1 month | >1 month | Univariable analysis | |||||||
OR | 95% CI | p-value | n (%#) | n (%#) | OR | 95% CI | p-value | |||||
Cluster 1 | 8 | 7620 | 164 (74.2) | 57 (25.8) | Comparison group | 73 (82.9) | 15 (17.1) | Comparison group | ||||
Cluster 2 | 6 | 6422 | 52 (80.0) | 13 (20.0) | 0.7 | 0.4–1.4 | 0.3 | 22 (88.0) | 3 (12.0) | 0.7 | 0.2–2.5 | 0.5 |
Cluster 3 | 8 | 3618 | 167 (82.3) | 36 (17.7) | 0.6 | 0.4–1.0 | 0.05 | 40 (52.6) | 36 (47.4) | 4.4 | 2.1–9.0 | <0.001 |
Cluster 4 | 7 | 7002 | 75 (62.0) | 46 (38.0) | 1.8 | 1.1–2.8 | 0.02 | 40 (64.5) | 22 (35.5) | 2.7 | 1.2–5.7 | 0.01 |
Cluster 5 | 11 | 6740 | 44 (67.7) | 21 (32.3) | 1.4 | 0.7–2.5 | 0.3 | 29 (46.8) | 33 (53.2) | 5.5 | 2.6–11.7 | <0.001 |
Cluster 6 | 6 | 7034 | 61 (69.3) | 27 (30.7) | 1.3 | 0.7–2.2 | 0.4 | 36 (66.7) | 18 (33.3) | 2.4 | 1.1–5.4 | 0.03 |
Cluster 7 | 6 | 6870 | 38 (82.6) | 8 (17.4) | 0.6 | 0.3–1.4 | 0.2 | 28 (82.3) | 6 (17.7) | 1 | 0.4–3.0 | 0.9 |
Cluster 8 | 4 | 9858 | 45 (90.0) | 5 (10.0) | 0.3 | 0.1–0.8 | 0.02 | 7 (87.5) | 1 (12.5) | 0.7 | 0.1–6.1 | 0.7 |
#: Proportions calculated out of each general practice cluster as row proportions. IGRA: interferon-γ release assay.