Introduction:
The aim of this study was to assess differences in the effects of income level on the primary and secondary prevention of stroke in the Chinese population.

Material and methods:
This was a population-based study using data from a China Kadoorie Biobank survey that began in 2004 in 10 geographical regions. Community residents (n = 512,715) aged 30–79 years were recruited. Stroke was determined by the self-reporting of a doctor’s diagnosis, and participants with a high risk of stroke were identified using the model developed in the Prediction for ASCVD Risk in China study.

Results:
The final numbers of people included in this study were 8,884 with stroke and 218,972 with a high risk of stroke. The participants’ income level was positively associated with high levels of physical activity and the consumption of a healthy diet, but negatively associated with the control of alcohol consumption (all p < 0.05). In addition, positive associations were observed between the control of smoking and the use of antiplatelet and antihypertensive medication for primary prevention (all p < 0.05), but there was a negative association with the control of blood pressure (p < 0.001).

Conclusions:
Low-income individuals were less likely to control smoking and their diet and use preventive medications, while high-income individuals were less likely to control their alcohol consumption and blood pressure. Moreover, medication use was low for both primary and secondary prevention in high-income individuals.