Table 4. Indicators of potential selection bias stratified by staff group.

	Nursing staff			Physicians
Indicator	Assessed admissions, n = 1820	Non-assessed admissions, n = 1028	p-value	Assessed admissions, n = 734	Non-assessed admissions, n = 2114	p-value
Age, years	65 (50–76)	64 (46–76)	0.07	63 (48–75)	65 (48–76)	0.16
In-hospital mortality, n (%)	56 (3.1%)	33 (3.2%)	0.96	21 (2.9%)	68 (3.2%)	0.68
WPS score	1 (0–2)	1 (0–2)	0.40	1 (0–2)	1 (0–2)	0.65
Predicted mortality by Prytherch score, %	8.0% (3.1–17.1%)	7.3% (2.7–16.9%)	0.17	7.4% (3.0–16.2%)	8.0% (2.9–17.3%)	0.37
Length of stay, days	1 (1–5)	1 (1–5)	0.49	1 (1–5)	1 (1–5)	0.80
Charlson co-mobidity score	2 (1–4)	2 (1–4)	0.61	2 (1–4)	2 (1–4)	0.03

Data is reported as median (inter-quartile range) unless otherwise specified. WPS = Worthing physiological score. IQR = inter-quartile range.