Table 3.

Hazard ratios (HR) of bariatric surgery by individual characteristics, Cox regression analysis

	Period 1990–2005						Period 2006–2010
	Univariate model			Multivariate model			Univariate model			Multivariate model
	HR	95 % CI		HR	95 % CI		HR	95 % CI		HR	95 % CI
Gender
Men	1.00			1.00			1.00			1.00
Women	3.45	3.28	3.63	3.49	3.32	3.68	3.11	2.99	3.24	3.08	2.95	3.21
Age at baseline (years)
20–29	1.00			1.00			1.00			1.00
30–39	0.91	0.86	0.96	0.90	0.85	0.95	1.74	1.65	1.83	1.73	1.64	1.83
40–49	0.70	0.67	0.74	0.66	0.62	0.70	1.54	1.46	1.63	1.41	1.33	1.50
50–64	0.24	0.22	0.26	0.20	0.18	0.22	0.65	0.61	0.69	0.57	0.53	0.61
Family income (quartiles)
Low income	1.08	1.01	1.16	0.65	0.60	0.70	1.49	1.40	1.58	1.32	1.24	1.41
Intermediate-low income	1.69	1.59	1.80	1.01	0.95	1.08	2.44	2.31	2.57	1.41	1.33	1.50
Intermediate-high income	1.36	1.28	1.45	0.97	0.91	1.04	1.77	1.67	1.87	1.27	1.20	1.36
High income	1.00			1.00			1.00			1.00
Marital status
Married/cohabiting	1.00			1.00			1.00			1.00
Never married, widowed/divorced	1.08	1.04	1.13	0.91	0.87	0.96	0.96	0.92	0.99	1.11	1.07	1.15
Educational attainment
Low	1.60	1.50	1.70	2.38	2.23	2.54	0.91	0.87	0.95	1.67	1.59	1.76
Intermediate	2.62	2.47	2.78	2.52	2.37	2.68	1.84	1.77	1.92	2.01	1.93	2.10
High	1.00			1.00			1.00			1.00
Employment status
Employment	1.00			1.00			1.00			1.00
Unemployment	0.76	0.71	0.80	0.88	0.82	0.94	1.03	0.99	1.07	1.37	1.31	1.43