Table 1.

 Odds ratios (95% confidence intervals) adjusted for clustering (186 977 patients in 304 providers) for emergency admission by social factors and admission period for patients with colorectal cancer (1 April 1999 to 31 March 2006)

Variable	Total*	No (%) of emergency admissions†	Univariable model			Multivariable model‡
			Odds ratio (95% CI)	P value§		Odds ratio (95% CI)	P value§
Men	102 772	30 933 (30.1)	1	<0.001		1	<0.001
Women	84 205	29 751 (35.3)	1.27 (1.25 to 1.30)			1.15 (1.12 to 1.17)
Fifth of index of multiple deprivation:
1 (most deprived)	34 404	13 026 (37.9)	1	<0.001		1	<0.001
2	36 470	12 522 (34.3)	0.84 (0.81 to 0.86)			0.83 (0.80 to 0.86)
3	39 309	12 586 (32.0)	0.76 (0.73 to 0.78)			0.75 (0.72 to 0.77)
4	39 753	11 861 (29.8)	0.68 (0.66 to 0.71)			0.68 (0.65 to 0.70)
5 (least deprived)	37 041	10 689 (28.9)	0.66 (0.63 to 0.68)			0.66 (0.64 to 0.68)
Age group (years):
50-59	25 002	6102 (24.4)	1	<0.001		1	<0.001
60-69	47 149	11 891 (25.2)	1.03 (1.00 to 1.07)			1.05 (0.98 to 1.11)
70-79	67 625	20 587 (30.4)	1.33 (1.29 to 1.38)			1.41 (1.33 to 1.49)
80-89	41 299	18 235 (44.2)	2.41 (2.32 to 2.49)			2.53 (2.37 to 2.69)
≥90	5902	3869 (65.6)	5.83 (5.48 to 6.20)			5.85 (5.23 to 6.55)
Admission period (reporting period 1 April to 31 March):
Per year	—	—	0.985 (0.979 to 0.990)	<0.001		0.996 (0.982 to 1.011)	0.595
Interaction between age group and admission period:
50-59×period	—	—	—	—		1	0.01
60-69×period	—	—	—	—		0.996 (0.978 to 1.014)
70-79×period	—	—	—	—		0.979 (0.963 to 0.995)
80-89×period	—	—	—	—		0.978 (0.961 to 0.995)
≥90×period	—	—	—	—		0.989 (0.959 to 1.020)

*Figures based on first admission. Identification of patients with colorectal cancer based on 1st to 4th diagnosis fields.

†As percentage of total admissions.

‡Intraclass correlation coefficient 0.026 (0.020 to 0.033).

§Wald tests of significance.