Skip to main content

Table 1 Summary statistics of the included trials

From: Are the effects of blood pressure lowering treatment diminishing?: meta-regression analyses

  K mean (sd) minimum maximum
All trials
 Trial start year (years) 82 1993.0 (10.3) 1964 2010
 Sample size (number of participants) 85 4036.8 (4919.6) 194 25,620
 Age (years) 84 61.0 (10.0) 29.7 83.8
 Baseline SBP (mmHg) 84 148.9 (18.5) 112.0 196.4
 SBP difference (mmHg) 81 7.3 (6.2) −0.1 31.4
 Region 11 in Asia, 27 in Europe, 16 in North America, 2 in Oceania, 1 in South America, 28 in mixed regions
Trials on all-cause mortality
 Trial start year (years) 79 1993.0 (10.4) 1964 2010
 Sample size (number of participants) 82 4119.0 (4989.8) 194 25,620
 Age (years) 81 61.0 (10.1) 29.7 83.8
 Baseline SBP (mmHg) 81 148.6 (18.8) 112.0 196.4
 SBP difference (mmHg) 78 7.3 (6.2) −0.1 31.4
 Region (mmHg) 9 in Asia, 26 in Europe, 16 in North America, 2 in Oceania, 1 in South America, 28 in mixed regions
Trials on stroke
 Trial start year (years) 71 1992.8 (10.3) 1964 2010
 Sample size (number of participants) 74 4459.0 (5133.6) 281 25,620
 Age (years) 73 62.6 (8.7) 29.7 83.8
 Baseline SBP (mmHg) 74 150.9 (18.1) 112.0 196.4
 SBP difference (mmHg) 71 7.9 (6.3) −0.1 31.4
 Region 11 in Asia, 22 in Europe, 15 in North America, 2 in Oceania, 24 in mixed regions
  1. K = number of trials; sd = standard deviation