Table 1.

Characteristics of the study population

		Cross-sectional			Retrospective cohort			p Value
		n	%	95% CI	n	%	95% CI
Sex	Women	5975	52.5	51.6 to 53.4	547	50.3	47.3 to 53.2	n.s.
Age	Mean (SD)	40.2	26.9		42.1	26	31.3 to 36.9	0.02
Department	Medical wards	4045	35.5	34.7 to 36.4	371	34.1	31.3 to 36.9	.001
	Surgery/gynaecology	3898	34.3	33.4 to 35.1	435	40.0	37.1 to 42.9
	Obstetrics	1241	10.9	10.3 to 11.5	109	10.0	8.2 to 11.8
	Paediatrics	1701	14.9	14.3 to 15.6	128	11.8	9.9 to 13.7
	Intensive care	494	4.3	4 to 4.7	45	4.1	3 to 5.3
Hospital complexity	Tertiary	10 520	92.5	92 to 92.9	1011	92.9	91.4 to 94.4	n.s.
	Secondary (with surgery and ICU wards)	859	7.5	7.1 to 8	77	7.1	5.6 to 8.6
Admission type	Unplanned admission	8031	70.6	69.7 to 71.4	726	66.7	63.9 to 69.5	n.s.
	Planned admission	2099	18.4	17.7 to 19.2	190	17.4	15.2 to 19.7
Intrinsic risk factors	Yes	6128	53.9	52 to 54.8	615	56.5	53.6 to 5.5	n.s.
	No	5251	46.1	45.2 to 47.1	473	43.5	40.5 to 46.4
Extrinsic risk factors	Yes	8484	74.6	73.8 to 75.4	844	77.6	75.1 to 80.1	0.03
	No	2895	25.4	24.6 to 26.2	244	22.4	19.9 to 24.9
Patients studied		11 379			1088

n.s., not significant (p>0.05).