Secular Trends of the Impact of Overweight and Obesity on Hypertension in Yi People: Yi Migrant Study, 1996–2015

Table 2

Relative odds of hypertension in Yi people, Yi Migrant Study, 1996–2015^a.

Variable	Model 1						Model 2^b
	Total		Yi farmers		Yi migrants		Total		Yi farmers		Yi migrants
	OR	95% CI	OR	95% CI	OR	95% CI	OR	95% CI	OR	95% CI	OR	95% CI
BMI^c category
Underweight (BMI <18.5)	0.51	0.34, 0.68	0.50	0.32, 0.75	0.52	0.27, 0.93	0.51	0.34, 0.68	0.50	0.32, 0.75	0.52	0.27, 0.93
Normal weight (BMI 18.5–23.9)	1.00	Referent	1.00	Referent	1.00	Referent	1.00	Referent	1.00	Referent	1.00	Referent
Overweight/obesity (BMI ≥24.0)	2.89	2.62, 3.59	2.86	2.22, 3.67	2.93	2.37, 3.63	2.89	2.62, 3.59	2.86	2.22, 3.67	2.93	2.37, 3.63
Time period
Period 1 (1996)	1.00	Referent	1.00	Referent	1.00	Referent	0.72	0.55, 0.94	0.77	0.48, 1.19	0.62	0.44, 0.87
Period 2 (2007–2008)	1.39	1.07, 1.83	1.30	0.85, 2.08	1.61	1.15, 2.29	1.00	Referent	1.00	Referent	1.00	Referent
Period 3 (2015)	1.92	1.47, 2.52	2.18	1.41, 3.49	1.82	1.30, 2.59	1.38	1.17, 1.63	1.67	1.31, 2.15	1.13	0.89, 1.43

BMI: body mass index; OR: odds ratio; CI: confidence interval. a: all models were adjusted for age, sex, education, and smoking. b: model 2 rearranged period 2 as reference group and otherwise had the same parameters as model 1. c: weight (kg)/height (m)².