1 China Rural Health Initiative – Sodium Reduction Study: the effects of a community-based sodium reduction program on 24hr urinary sodium and blood pressure.

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Presentation transcript:

1 China Rural Health Initiative – Sodium Reduction Study: the effects of a community-based sodium reduction program on 24hr urinary sodium and blood pressure in rural China Dr Nicole Li 18 th November 2013

22 Background Cardiovascular diseases are the leading cause of death in China, responsible for more than 3 million deaths each year. Stroke, high blood pressure and excess salt consumption (12-15g/day) highly prevalent in rural China Little debate about the adverse effects of salt consumption at this level, or the potential benefits of salt restriction

33 To define the effects of a novel, low-cost, scalable and sustainable, community-based salt reduction strategy on salt consumption, as estimated from 24-hour urinary sodium excretion 3 Objective

44 Design 120 villages 60 villages in intervention group 30 villages with price subsidy 30 villages without price subsidy 60 villages in control group Randomized

55 Intervention and control Intervention Control: usual practice 5 Access to salt substitute  Salt Substitute 65-75% NaCl 15-25% KCl 0-10%MgSO4 Double cost of usual salt Promotion of sales Health education  Health belief model Awareness Beliefs Behavior  Key messages  Implementation Strategy +

66 Outcomes Primary  24h urinary sodium (90% power,11mmol/day difference) Secondary  24-hour urinary potassium  Na/K ratio  Knowledge, attitude and practices  Systolic and diastolic blood pressure  Proportion with hypertension Questionnaire, examination and 24hr urine collection

77 Analysis Intention to treat, no imputation for missing value GEE model accounting for cluster effects Primary comparison of 60 intervention vs. 60 control villages Secondary comparison of 30 price subsidy vs. 30 no price subsidy villages Pre-defined subgroups – age, sex, education, BMI, smoking , alcohol

88 Survey data 60 intervention villages  1,295 questionnaire and examination  1,063 urine sample (82%) 59 control villages  1,272 questionnaire and examination  1,001 urine sample (77%)

99 Characteristics of survey participants

10 Effects on 24hr urinary sodium and potassium Na/K ratio -0.9(-1.2 to -0.5, p<0.001)

11 Effects on blood pressure outcomes Systolic blood pressure -1.0mmHg (-3·2 to 1·2), p=0.39 Diastolic blood pressure -0·8mmHg (-2·3 to 0·8), p=0.34 Percent with hypertension -2·2% (-5·5 to 1·2), p=0.20

12 Effects on knowledge and behaviors

13 1.0g lower salt intake delivers: 1.8%-2.8% reduced risk of stroke 13mmol sodium reduction (0.75g Salt reduction): 1.4%-2.1% reduced risk of stroke 1.4%-2.1% reduction of 2 million new stroke cases ≈ 28 , ,000 strokes prevented each year in China Additional effects of potassium supplementation not included. K. Bibbins-Domingo et al.. N Engl J Med. 20 Jan, 2010 Interpretation

14 Discussion Strengths  Robust large scale randomized design  Excellent statistical power for primary outcome  Gold standard 24 hour urine collections  Simple, low-cost, scalable intervention Weakness  Limited power for secondary blood pressure and hypertension outcomes

15 Conclusions Anticipated effects on sodium excretion were achieved Effects appear to have been driven primarily by use of the salt substitute (through provision of education and access) Subsidization of the price of salt substitute was important for uptake Salt substitution has significant potential to reduce the large burden of blood-pressure related disease in rural China

16 Acknowledgement Sponsors  The US NIH NHLBI  The US CDC DHDSP  United Health Group Partners  US CDC  The Duke University  The George Institute for Global Health, Australia  Peking University Health Science Center  China Medical University  Jiaotong University Medical College  Hebei Provincial CDC  Ningxia Medical University  Changzhi Medical University