Table 2

Relative chance of having a hospital stay ≤1 day

		Univariate		Multivariate
	Number of patients included	RR	p Value	RR	p Value
Marital status
Married/cohabiting	136	Ref		Ref
Living alone	43	1.01 (0.90 to 1.12)	0.924	0.97 (0.88 to 1.08)	0.596
Living apart	13	0.91 (0.87 to 0.96)	0.001	0.94 (0.86 to 1.02)	0.120
Smoking
No	173	Ref		Ref
Yes	18	1.10 (1.05 to 1.16)	0.001	1.08 (1.00 to 1.16)	0.043
Method of surgery
Partial mastectomy	135	Ref		Ref
Mastectomy	57	0.80 (0.69 to 0.92)	0.002	0.88 (0.78 to 1.00)	0.037
Associated surgery
Sentinel node/no axillary operation	149	Ref		Ref
Axillary lymph node dissection	45	0.78 (0.67 to 0.93)	0.004	0.82 (0.70 to 0.96)	0.013
Age	190	−0.00 (−0.01 to 0.00)	0.732	−0.00 (−0.00 to 0.00)	0.933
Alcohol intake
Modest	104	Ref		Ref
Moderate/heavy*	88	1.12 (1.02 to 1.22)	0.012	1.10 (1.01 to 1.19)	0.026
Saltin-Grimby Activity Level Scale†
1	26	Ref
2	127	1.07 (0.90 to 1.27)	0.443	1.09 (0.93 to 1.29)	0.315
3+4	41	1.15 (0.97 to 1.37)	0.103	1.13 (0.98 to 1.32)	0.051

*Moderate/heavy consumption equals more than 1 unit/week.
†Levels of physical activity are categorised accordingly: (1) physically inactive, (2) some light physical activity, (3) regular physical activity and training and (4) regular hard physical training for competition sports.
RR, relative risk.