The Additive Interaction between Body Mass Index and Hypertension Family History in Han and Yugur: The China National Health Survey (CNHS)

Table 3

Associations and interactions of BMI and FHH on hypertension in Han and Yugur people adjusted for behavioral risk factors in China.

	Han (N=4195)				Yugur (N=1596)
	OR (95% CI)	RERI (95% CI)	AP (95% CI)	SI (95% CI)	OR (95% CI)	RERI (95% CI)	AP (95% CI)	SI (95% CI)
Model overweight
FHH(-)
Normal weight	1.00				1.00
Overweight	2.77 (2.12, 3.61)				3.15 (1.89, 5.25)
FHH(+)
Normal weight	3.54 (2.75, 4.57)				2.96 (1.86, 4.71)
Overweight	7.91 (6.12, 10.23)	2.60 (1.17, 4.03)	0.33 (0.19, 0.47)	1.60 (1.26, 2.05)	5.74 (3.65, 9.03)	0.63 (-1.22, 2.48)	0.11 (-0.20, 0.42)	1.15 (0.75, 1.77)
Model obesity
FHH(-)
Normal weight	1.00				1.00
Obesity	4.61 (3.05, 6.98)				8.09 (4.44, 14.77)
FHH(+)
Normal weight	3.74 (2.87, 4.86)				2.81 (1.77, 4.45)
Obesity	14.06 (9.76, 20.25)	6.72 (2.10, 11.33)	0.48 (0.28, 0.67)	2.06 (1.36, 3.11)	14.16 (8.61, 23.28)	4.25 (-1.56, 10.06)	0.30 (-0.04, 0.64)	1.48 (0.87, 2.51)

Models were adjusted for age, gender, current residence, educational level, smoking status, alcohol consumption, and physical activity.
BMI: body mass index, FHH: family history of hypertension, RERI: the relative excess risk due to interaction, AP: the attributable proportion due to interaction, SI: the synergy index.
Interaction was present if the 95% CIs of RERI and AP did not include 0 and the 95% CIs of SI did not include 1.