Relationship between novel anthropometric indices and the incidence of hypertension in Chinese individuals: a prospective cohort study based on the CHNS from 1993 to 2015

Table 4 Stratified analysis of anthropometric indices and incidence of hypertension

subgroup	sample size	HR (95%CI)	P interaction	HR (95%CI)	P interaction
subgroup	sample size	ABSI z score		BRI z score
Baseline age
< 40	6176	1.09 (1.04, 1.15)	0.285	1.43 (1.35, 1.50)	<0.001
>=40	5798	1.06 (1.02, 1.10)		1.20(1.15, 1.24)
Sex
Male	5484	1.06 (1.01 1.10)	0.282	1.28 (1.22, 1.34)	0.279
Female	6490	1.08 (1.04, 1.13)		1.25 (1.20, 1.30)
Race
Hans	10,646	1.08 (1.04, 1.11)	0.953	1.27(1.23, 1.30)	0.795
Non-Hans	1328	1.08 (0.98, 1.19)		1.28(1.17, 1.40)
Residence
Urban	4418	1.05 (1.00, 1.11)	0.444	1.24 (1.18, 1.30)	0.193
Rural	7556	1.09 (1.05, 1.13)		1.28 (1.24, 1.33)
Smoking
Yes	8413	1.07 (1.03, 1.11)	0.777	1.25 (1.20, 1.29)	0.104
No	3561	1.08 (1.03, 1.14)		1.32 (1.25, 1.40)
Drinking
Yes	7815	1.10 (1.05, 1.14)	0.041	1.27(1.23, 1.32)	0.346
No	4159	1.03 (0.98, 1.09)		1.25 (1.19, 1.31)
Systolic blood pressure
< 120 mmHg	7634	1.07 (1.02, 1.11)	0.927	1.28 (1.22, 1.34)	0.367
>=120 mmHg	4340	1.08 (1.03, 1.12)		1.24 (1.20, 1.30)
Diastolic blood pressure
< 80 mmHg	8021	1.08 (1.04, 1.03)	0.513	1.29 (1.23, 1.34)	0.182
>=80 mmHg	3953	1.07 (1.02, 1.11)		1.24 (1.19, 1.30)

ABSI: a body shape index, BRI: body round index, HR: hazard ratio, CI: confidence interval;
The anthropometric measures were converted to z scores using the equation: (X-X_mean)/X_SD;
Each stratification adjusted for all the factors (age, sex, race, residence, smoking, drinking, systolic blood pressure, and diastolic blood pressure) except the stratification factor itself

ISSN: 1471-2458