Table 1

Distribution of missed and delayed observations and proportion of HPPD deriving from long shifts

	Mean	Median	IQR	Min	Max
Expected observations per 24 hours in each ward	7.6	5	2–10	1	87
Delayed observations per 24 hours in each ward	4.1	2	1–5	0	56
Missed observations per 24 hours in each ward	3.4	2	1–4	0	51
Percentage of HCA-HPPD derived by ≥12-hour shifts	46	57	0–79	0	100
Percentage of RN-HPPD derived by ≥12-hour shifts	48	61	0–82	0	100

HCA-HPPD, healthcare assistant hours per patient day; HPPD, hours per patient day; RN-HPPD, registered nurse hours per patient day.