Bulletin of the World Health Organization

Cardiovascular risk management and its impact on hypertension control in primary care in low-resource settings: a cluster-randomized trial

Shanthi Mendis, S Claiborne Johnston, Wu Fan, Olulola Oladapo, Ali Cameron & Mohammed F Faramawi

Volume 88, Number 6, June 2010, 412-419

Table 2. Risk distribution of sample at follow-up visits among participants in a clinical trial of the World Health Organization risk management package for cardiovascular disease, China and Nigeria, 2005–2006

Characteristic Site Aa
Site Bb
Intervention
(n = 603)
Control
(n = 606)
Intervention
(n = 588)
Control
(n = 600)
No. % No. % No. % No. %
4 month follow-up
Attended visit 601 99.7 605 99.8 588 100.0 598 99.7
Low riskc 104 17.3 80 13.2 136 23.1 96 16.1
Medium riskd 484 80.5 516 85.3 444 75.5 483 80.8
SBP > 179 mmHge 13 2.2 7 1.2 8 1.4 15 2.5
Missing data 0 0.0 2 0.3 0 0.0 4 0.7
8 month follow-up
Attended visit 597 99.0 605 99.8 588 100.0 596 99.3
Low riskf 459 76.9 505 83.5 382 65.0 280 47.0
Medium riskg 138 23.1 99 16.4 206 35.0 315 52.9
Missing data 0 0.0 1 0.2 0 0.0 1 0.2
12 month follow-up
Attended visit 584 96.8 605 99.8 530 90.1 447 74.5

mmHg, millimetres of mercury; SBP, systolic blood pressure.

a China.

b Nigeria.

c SBP < 150 mmHg, and age ≤ 50, and non-smoker.

d SBP 150–179 mmHg; or SBP < 150 mmHg and age > 50; or SBP < 150 mmHg and smoker; or SBP < 150 mmHg and age > 50 and smoker.

e Referred to higher level of care.

f SBP < 150 mmHg.

g SBP ≥ 150 mmHg.

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