Table 2. The 30- and 90-day death rates following operation for oesophageal cancer.

		No. of deaths		Standardised death rate per 100 patients		95% CI
	No. of admissions	30 day	90 day	30 day	90 day	30 day	90 day
Quintile 1	1704	162	257	9.87	15.56	8.41–11.52	13.72–17.59
Quintile 2	1325	125	198	9.45	14.93	7.87–11.27	12.93–17.17
Quintile 3	1208	80	142	6.45	11.52	5.12–8.04	9.70–13.58
Quintile 4	1013	78	116	7.48	11.21	5.91–9.33	9.26–13.45
Quintile 5	900	65	108	7.17	11.95	5.53–9.14	9.80–14.43

Overall 30 day CFR=8.3 per 100, test for trend: χ²=9.5 df=1 P=0.002.

Overall 90 day CFR=13.4 per 100, test for trend: χ²=12.6: df=1: P=0.0004.