【Objective】 To explore the association of elevated blood pressure (BP) with blood glucose

health-related behavior

as well as the interaction between BP influencing factors. 【Methods】 A cross-sectional cluster sampling survey was carried out for the population aged from 50 to 79 years old

living in two communities of Guangzhou. Data about health-related behavior

BP

fasting plasma glucose (FPG) and body mass index (BMI) of participants were collected. Among the 474 valid subjects (166 males and 308 females)

97 were classified as normal

183 were prehypertension (preHT) and 194 were hypertension (HT) according to the BP classification in the Seventh Report of the Joint National Committee on Prevention

Detection

Evaluation

and Treatment of High Blood Pressure (JNC 7). The characteristics of FPG and health-related behaviors among three BP groups were compared by using the univariate method. Influencing factors for elevated BP were analyzed by ordinal multinomial logistic regression

and the interaction analysis was conducted by use of an additive effect model. 【Results】 The mean levels of FPG

BMI

daily salt and cooking oil intake in the HT groups were higher than the normal and preHT groups

but for a lower mean score of positive coping style. And the perHT group had a higher mean FPG level compared with the normal one. Status of BP positively correlated with FPG (rs=0.304

P<0.001). In multivariate analysis

after adjusting for sex

age and history of HT

factors associated with elevated BP and their odds ratios (95% confidence intervals

CI) were: obesity 4.043(1.962~8.331)

impaired fasting glucose 2.016(1.259~3.228)

diabetes mellitus 3.647 (1.986~6.700)

excessive salt 2.430 (1.557~3.792) and cooking oil 1.624 (1.101~2.396) intake

positive coping style 0.532 (0.389~0.726). After adjustment of the confounding factors

positive interaction was observed between age and salt intake; its relative excess risk due to interaction

attributable proportion due to interaction and synergy index (95%CI) were 2.952 (0.898~5.006)

0.640 (0.437~0.844) and 5.493 (1.161~25.950) respectively. 【Conclusions】 The abnormality of FPG

obesity

excessive salt and cooking oil intake and positive coping style were significantly associated with elevated BP in middle aged residents. There might be positive interaction between age and salt intake on the effect of elevated BP

which was worth further study.