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. 2019 Jul 3;29(4):277–285. doi: 10.1136/bmjqs-2018-008664

Table 2.

Rates of AEs, by site

Hospital A Hospital B Hospital C Hospital D Hospital E Total
246 235 243 313 122 1159
Triggers
N 241 152 177 84 146 800
Mean/patient±SD 0.98±1.36 0.65±1.10 0.73±1.17 0.27±0.62 1.20±1.46 0.69±1.16
Observations days
Sum (mean/patient) 1901 (7.7) 1789 (7.6) 2660 (10.9) 2662 (8.5) 1342 (11.0) 10 354 (8.9)
Events N
AE 127 62 92 35 40 356
Preventable AE 99 40 82 31 37 289
Non-preventable AE 28 22 10 4 3 67
Potential AE 37 30 26 9 39 141
Risk* N (%)
AE 88 (35.8%) 48 (20.4%) 63 (25.9%) 31 (9.9%) 27 (22.1%) 257 (22.2%)
Preventable AE 73 (29.7%) 33 (14.0%) 60 (24.7%) 31 (9.9%) 26 (21.3%) 223 (19.2%)
Non-preventable AE 25 (10.2%) 19 (8.1%) 9 (3.7%) 4 (1.3%) 3 (2.5%) 60 (5.2%)
Potential AE 33 (13.4%) 28 (11.9%) 23 (9.5%) 9 (2.9%) 29 (23.8%) 122 (10.5%)
Rate† (95% CI)
AE 6.7 (5.2–8.4) 3.5 (2.5–4.5) 3.5 (2.5– 4.6) 1.3 (0.8–1.8) 3.0 (1.8–4.3) 3.4 (3.0–3.9)
Preventable AE 5.2 (4.0–6.6) 2.2 (4.5–3.1) 3.1 (2.2–4.1) 1.2 (0.8–1.6) 2.8 (1.7–4.0) 2.8 (2.4–3.2)
Non-preventable AE 1.5 (0.9–2.1) 1.2 (0.6–1.8) 0.4 (0.1–0.6) 0.1 (0.0–0.3) 0.2 (0.0–0.5) 0.6 (0.5–0.8)
Potential AE 1.9 (1.2–2.7) 1.7 (1.1–2.3) 1.0 (0.6–1.4) 0.3 (0.1–0.6) 2.9 (1.8–4.1) 1.4 (1.1–1.6)

*Risk, number of encounters with at least one event/Total number of encounters observed×100%.

†Rate, total number of events/total number of days observed×100.

AE, adverse event.