Table 3.

 Odds ratios (95% confidence intervals) adjusted for clustering (191 103 patients in 301 providers) for emergency admission by social factors and admission period for women with breast cancer (1 April 1999 to 31 March 2006)

Variable	Total*	No (%) with emergency admission†	Univariable model			Multivariable model‡
			Odds ratio (95% CI)	P value§		Odds ratio (95% CI)	P value§
Fifth of index of multiple deprivation:
1 (most deprived)	31 236	5315 (17.0)	1	<0.001		1	<0.001
2	35 950	5256 (14.6)	0.82 (0.78 to 0.85)			0.82 (0.78 to 0.86)
3	40 966	5372 (13.1)	0.72 (0.69 to 0.76)			0.74 (0.71 to 0.78)
4	42 378	4957 (11.7)	0.65 (0.62 to 0.68)			0.70 (0.66 to 0.73)
5 (least deprived)	40 573	4344 (10.7)	0.57 (0.54 to 0.59)			0.63 (0.60 to 0.66)
Age group (years):
50-59	64 124	3542 (5.5)	1	<0.001		1	<0.001
60-69	55 289	4080 (7.4)	1.36 (1.30 to 1.43)			1.58 (1.47 to 1.71)
70-79	44 054	6832 (15.5)	3.09 (2.95 to 3.22)			3.04 (2.82 to 3.27)
80-89	23 339	8127 (34.8)	9.23 (8.82 to 9.65)			8.61 (7.97 to 9.29)
≥90	4297	2663 (62.0)	28.83 (26.82 to 31.00)			22.65 (19.89 to 25.80)
Admission period (reporting period 1 April to 31 March):
Per year	—	—	0.931 (0.925 to 0.938)	<0.001		0.923 (0.907 to 0.939)	<0.001
Interaction between age group and admission period:
50-59×period	—	—	—	—		1	<0.001
60-69×period	—	—	—	—		0.948 (0.926 to 0.971)
70-79×period	—	—	—	—		1.002 (0.981 to 1.024)
80-89×period	—	—	—	—		1.022 (1.000 to 1.045)
≥90×period	—	—	—	—		1.083 (1.045 to 1.123)

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

†As percentage of total admissions.

‡Intraclass correlation coefficient 0.211 (0.175 to 0.251).

§Wald tests of significance.