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Table 1 Study characteristics

From: Prehypertension and incidence of cardiovascular disease: a meta-analysis

Study Country Prevalence of prehypertension (%) Sample size (% women) Age (y), average (range or SD) Follow-up (y) Participants with baseline CVD excluded Events for analysis
Wu, 2002*[7] China 35.3 27,739 (46.3) 47.4 (35 to 64) 7 Not report CVD
Asayama, 2004 [18] Japan 46 1,702 (61) 60.6 (10.7) 10.6 Free of stroke Stroke
Liszka, 2005 [8] United States 33 8,986 (54.6) NA (≥25) 18 No CVD, stroke, MI
Lee, 2006 [19] United States 32.6 4,372 (60.6) 56.2(45 to 74) 12 Yes CHD
Qureshi, 2005 [9] United States 41.1 5,181 (55.3) 44.0 (8.6) 31 Yes CAD, stroke, MI
Kshirsagar,2006 [20] United States 37.3 8,960 (55) 53(45 to 64) 11.6 Yes CVD, CHD, stroke
Hsia, 2007 [21] United States 39 60,785 (100) 62.8 (7.0) 7.7 Yes CVD, MI, stroke
Onat, 2008 [22] Turkey 32.8 3,034 (50.4) 48 (12) 6.6 Free of DM and CHD CHD
Kokubo, 2008 [23] Japan 35 5,494 (53) 55 (30 to 79) 11.7 Yes CVD, MI, stroke
Zhang, 2008 [24] United States 32.1 4,507 (60) 56 (45 to 74) 13.4 Free of stroke Stroke
Gu, 2009 [25] China 34.5 158,666 (51) 56 (≥40) 7.7 No CVD, CHD, stroke
Ikeda, 2009 [26] Japan 43 33,372 (65) 54 (40 to 69) 11.0 Yes CHD, stroke
Ishikawa, 2010 [27] Japan 32.3 11,000 (61.3) 55.1 (11.5) 10.7 Yes CVD
Tanaka, 2010 [28] Japan 25.2 22,676 (66) 62 (40 to 80) 2.7 Yes Ischemic stroke
Wu, 2012 [29] China 30.0 100,116 (20.1) 49.4 (30 to 70) 4 Yes CVD, stroke
Hadaegh, 2013 [30] Iran 34.5 6,273(57) 47.1 (≥30) 9.3 Yes CVD, CHD
Sadeghi, 2012[10] Iran 36 3,255 (100) 49.7 (≥35) 6.7 Yes CVD, CHD, stroke
Fukuhara, 2012 [31] Japan 37.7 2,634 (58) 59.1 (≥40) 19 Yes CVD, CHD, Stroke
Erbel, 2012 [11] Germany 26.2 4,181 (53) 59.3 (40 to 75) 7.18 Yes MI,stroke , revascularization
  1. * Article in Chinese; Authors contacted for clarification of data.
  2. CHD Coronary heart disease, CVD Cardiovascular disease, DM Diabetes mellitus, MI Myocardial infarction, NA indicates not available.