TB incidencea | Survey | nb | median | (IQR) | mean | (SD) | p-valuec | ||
---|---|---|---|---|---|---|---|---|---|
Nurses | No. contacts screened in the last month | Total | Initial | 57 | 21 | (11–36) | 37.1 | (53.5) | |
Follow-up | 55 | 20 | (8–40) | 33.9 | (45.1) | 0.37 | |||
Low | Initial | 26 | 16 | (6–35) | 23.8 | (24.8) | |||
Follow-up | 23 | 15 | (6–25) | 17.2 | (13.8) | 0.13 | |||
Medium | Initial | 17 | 25 | (14–30) | 30.2 | (26.2) | |||
Follow-up | 18 | 23 | (15–42) | 43.7 | (43.7) | 0.18 | |||
High | Initial | 14 | 32.5 | (14–100) | 70.2 | (93.3) | |||
Follow-up | 14 | 16.5 | (10–80) | 48.6 | (58.9) | 0.24 | |||
No. hours spent on contact tracing in the last month | Total | Initial | 55 | 8 | (4–16) | 12.0 | (10.8) | ||
Follow-up | 52 | 7.5 | (3.5-15.5) | 16.1 | (41.7) | 0.24 | |||
Low | Initial | 25 | 8 | (3–14) | 10.1 | (10.5) | |||
Follow-up | 21 | 6 | (3–15) | 11.5 | (14.7) | 0.35 | |||
Medium | Initial | 16 | 12 | (4–23) | 14.4 | (11.4) | |||
Follow-up | 18 | 7.5 | (4–12) | 10.2 | (7.8) | 0.10 | |||
High | Initial | 14 | 9 | (6–15) | 12.5 | (10.8) | |||
Follow-up | 13 | 8 | (3–16) | 31.9 | (81.1) | 0.19 | |||
% time spent on contact tracing | Total | Initial | 57 | 20 | (10–30) | 24.2 | (16.5) | ||
Follow-up | 54 | 20 | (10–25) | 21.7 | (17.6) | 0.22 | |||
Low | Initial | 26 | 20 | (10–25) | 21.2 | (16.1) | |||
Follow-up | 23 | 20 | (6–25) | 21.8 | (19.5) | 0.45 | |||
Medium | Initial | 17 | 20 | (20–30) | 24.1 | (13.8) | |||
Follow-up | 17 | 20 | (10–25) | 19.4 | (10.4) | 0.14 | |||
High | Initial | 14 | 30 | (15–40) | 30.0 | (19.7) | |||
Follow-up | 14 | 20 | (10–40) | 24.4 | (21.7) | 0.24 | |||
Health protection staff | Investigations initiated because of epidemiological links | Total | Initial | 23 | 0 | (0–1) | 0.5 | (0.8) | |
Follow-up | 21 | 1 | (0–2) | 2.8 | (6.1) | 0.04 | |||
Low | Initial | 15 | 0 | (0–1) | 0.3 | (0.62) | |||
Follow-up | 14 | 0.5 | (0–1) | 1.5 | (2.3) | 0.04 | |||
Medium | Initial | 3 | 1 | (0–1) | 0.7 | (0.7) | |||
Follow-up | 3 | 1 | (1–4) | 2.0 | (1.7) | 0.14 | |||
High | Initial | 5 | 0 | (0–1) | 0.8 | (1.3) | |||
Follow-up | 4 | 1.5 | (0.5-15) | 7.8 | (13.5) | 0.14 | |||
Strain typing used to provide more information in epidemiological investigation | Total | Initial | 22 | 0 | (0–1) | 0.6 | (1) | ||
Follow-up | 22 | 1 | (0–2) | 1.8 | (2.5) | 0.03 | |||
Low | Initial | 14 | 0 | (0–1) | 0.4 | (0.8) | |||
Follow-up | 14 | 0.5 | (0–2) | 1.4 | (2) | 0.05 | |||
Medium | Initial | 4 | 0.5 | (0–2) | 1.0 | (1.4) | |||
Follow-up | 3 | 1 | (0–2) | 1.0 | (1) | 0.50 | |||
High | Initial | 4 | 0.5 | (0–2) | 1.0 | (1.4) | |||
Follow-up | 5 | 2 | (1–3) | 3.2 | (4) | 0.17 | |||
Strain typing influences an epidemiological investigation | Total | Initial | 23 | 0 | (0–1) | 0.8 | (1.1) | ||
Follow-up | 14 | 0.5 | (0–2) | 1.2 | (1.6) | 0.17 | |||
Low | Initial | 14 | 0 | (0–1) | 0.4 | (0.8) | |||
Follow-up | 8 | 0 | (0–0.5) | 0.6 | (1.4) | 0.34 | |||
Medium | Initial | 4 | 0.5 | (0–2) | 1.0 | (1.4) | |||
Follow-up | 2 | 1 | (0–2) | 1.0 | (1.4) | 0.50 | |||
High | Initial | 5 | 1 | (1–3) | 1.6 | (1.3) | |||
Follow-up | 4 | 2 | (1.5-3.5) | 2.5 | (1.7) | 0.20 | |||
Investigation initiated because of strain typing | Total | Initial | 23 | 0 | (0–2) | 2.2 | (6.3) | ||
Follow-up | 22 | 0 | (0–1) | 1.1 | (2.3) | 0.79 | |||
Low | Initial | 14 | 0 | (0–1) | 0.4 | (0.8) | |||
Follow-up | 14 | 0 | (0–0) | 0.5 | (1.3) | 0.43 | |||
Medium | Initial | 4 | 0.5 | (0–1) | 0.5 | (0.6) | |||
Follow-up | 4 | 0.5 | (0–1.5) | 0.8 | (1) | 0.34 | |||
High | Initial | 5 | 4 | (3–6) | 8.6 | (12.2) | |||
Follow-up | 4 | 1 | (1–5.5) | 3.3 | (4.5) | 0.78 | |||
Epidemiological links identified in strain typing cluster | Total | Initial | 22 | 0 | (0–0) | 0.4 | (0.8) | ||
Follow-up | 20 | 0 | (0–0) | 0.4 | (0.8) | 0.52 | |||
Low | Initial | 13 | 0 | (0–0) | 0.2 | (0.6) | |||
Follow-up | 13 | 0 | (0–0) | 0.3 | (0.9) | 0.30 | |||
Medium | Initial | 3 | 0 | (0–1) | 0.3 | (0.6) | |||
Follow-up | 3 | 0 | (0–0) | 0.0 | (0) | 0.81 | |||
High | Initial | 6 | 0.5 | (0–1) | 0.8 | (1.2) | |||
Follow-up | 4 | 0.5 | (0–1.5) | 0.8 | (1) | 0.55 | |||
% time spent on investigations | Total | Initial | 23 | 1 | (0–5) | 2.7 | (3.2) | ||
Follow-up | 25 | 5 | (0–5) | 7.2 | (11.1) | 0.04 | |||
Low | Initial | 15 | 0 | (0–5) | 2.1 | (3.1) | |||
Follow-up | 15 | 5 | (0–12) | 8.3 | (13.1) | 0.04 | |||
Medium | Initial | 3 | 5 | (0–5) | 3.3 | (2.9) | |||
Follow-up | 4 | 5 | (2.5-5) | 3.8 | (2.5) | 0.42 | |||
High | Initial | 5 | 5 | (1–5) | 4.4 | (3.7) | |||
Follow-up | 6 | 3.5 | (0–5) | 6.2 | (9.5) | 0.35 |