Table 5.
Number, size and duration of outbreaks of gastroenteritis, by duration of participation in the surveillance network
| Number of years participating in the surveillance networka | Number of LTCFs with outbreaks of total (%) | Number of outbreaks | Mean duration of outbreaks in weeks (95% CI) | Mean number of cases per outbreak (95% CI) |
|---|---|---|---|---|
| 1 | 18/58 (31) | 32 | 1.8 (1.5–2.2) | 11.7 (6.7–16.6) |
| 2 | 19/46 (41) | 33 | 1.8 (1.4–2.2) | 13.3 (8.5–18.2) |
| 3 | 15/30 (50) | 23 | 1.3 (1.1–1.5) | 13.7 (7.3–20.0) |
| 4 | 6/19 (32) | 11 | 2.2 (1.5–2.9) | 14.5 (8.7–20.2) |
| 5 | 7/12 (58) | 12 | 1.6 (1.0–2.2) | 11.3 (6.0–16.5) |
| 6 | 2/8 (25) | 4 | 1.8 (0.2–3.3) | 23.8 (0–52.1) |
| 7 | 1/5 (20) | 3 | 1 (–) | 5.0 (2.5–7.5) |
a
Five LTCFs participated for 7 years, three for 6 years, four for 5 years, seven for 4 years, 11 for 3 years, 16 for 2 years and the remaining 12 for 1 year.