Table 3.

Odds ratios^* (OR) for obesity (BMI≥30) according to tertiles of selected land characteristics based on 250m and 500m buffers, by age group, the Sister Study

Land cover characteristic	Place of residence						Overall
	Rural or small town			Urban or suburban
	% obese	OR	95% CI	% obese	OR	95% CI	% obese	OR	95% CI
G1 (250 buffer)
Lowest tertile	33.1	1.0		30.3	1.0		31.0	1.0
Middle tertile	31.8	0.97	0.89 – 1.05	28.0	0.92	0.87 – 0.98	29.6	0.94	0.89 – 0.98
Upper tertile	29.7	0.93	0.86 – 1.00	24.7	0.81	0.75 – 0.87	28.0	0.87	0.83 – 0.92
G2 (250 buffer)
Lowest tertile	33.8	1.0		32.8	1.0		31.8	1.0
Middle tertile	31.7	0.91	0.84 – 0.99	31.1	0.91	0.87 – 0.96	29.9	0.91	0.87 – 0.96
Upper tertile	29.7	0.88	0.81 – 0.95	28.0	0.83	0.79 – 0.87	27.6	0.83	0.79 – 0.87
Impervious (250 buffer)
Lowest tertile	29.6	1.0		28.4	1.0		27.9	1.0
Middle tertile	31.8	1.06	0.99 – 1.14	29.8	1.09	1.03 – 1.15	28.8	1.09	1.03 – 1.15
Upper tertile	36.0	1.28	1.18 – 1.39	33.7	1.32	1.25 – 1.40	32.6	1.32	1.25 – 1.40
G1 (500 buffer)
Lowest tertile	33.3	1.0		29.9	1.0		30.6	1.0
Middle tertile	32.0	0.96	0.88 – 1.05	29.3	1.01	0.95 – 1.07	30.3	0.99	0.95 – 1.04
Upper tertile	30.1	0.95	0.87 – 1.03	25.8	0.85	0.79 – 0.91	28.3	0.90	0.86 – 0.95
G2 (500 buffer)
Lowest tertile	32.9	1.0		31.1	1.0		31.6	1.0
Middle tertile	32.3	0.98	0.90 – 1.06	28.6	0.91	0.86 – 0.97	30.1	0.93	0.89 – 0.98
Upper tertile	29.6	0.91	0.84 – 0.99	25.0	0.77	0.72 – 0.83	27.5	0.83	0.79 – 0.87
Impervious (500 buffer)
Lowest tertile	29.7	1.0		24.0	1.0		28.2	1.0
Middle tertile	32.0	1.06	0.99 – 1.14	27.3	1.15	1.05 – 1.25	28.8	1.08	1.03 – 1.14
Upper tertile	35.8	1.24	1.14 – 1.36	31.5	1.37	1.26 – 1.49	32.2	1.29	1.22 – 1.37

^*Odds ratios adjusted for age, ethnicity, marital status, population of census tract, and census area