Table 3 Subgroup analysis
Subgroup* | WMD (95% CI) | Test for overall effect | Test for heterogeneity | I2(%) |
|---|---|---|---|---|
Duration of study (weeks) | ||||
 < 3 months | ||||
  SBP | −7.93 [−11.23, −4.62] | P < 0.001 | P = 0.84 | 0 |
  DBP | −5.02 [−8.32, −1.72] | P = 0.003 | P = 0.97 | 0 |
 ≥3 months | ||||
  SBP | −9.78 [−13.03, −6.53] | P < 0.001 | P = 0.93 | 0 |
  DBP | −3.71 [− 5.63, − 1.79] | P < 0.001 | P = 0.53 | 0 |
Mean age of subjects | ||||
 < 65 years old | ||||
SBP | −10.38 [− 16.16, −4.60] | P < 0.001 | P = 0.83 | 0 |
DBP | −4.22 [−7.85, −0.58] | P = 0.02 | P = 0.91 | 0 |
 ≥65 years old | ||||
SBP | −9.98 [−14.06, −5.90] | P < 0.001 | P = 0.55 | 0 |
DBP | −3.09 [−6.45, 0.27] | P = 0.07 | P = 0.18 | 42 |
Quality of studies | ||||
 High quality | ||||
SBP | −9.14 [−12.33, −5.95] | P < 0.001 | P = 0.86 | 0 |
DBP | −4.98 [−7.05, −2.91] | P < 0.001 | P = 0.98 | 0 |
 Low quality | ||||
SBP | −9.49 [−14.15, −4.84] | P < 0.001 | P = 0.60 | 0 |
DBP | −2.13 [−5.02, 0.77] | P = 0.15 | P = 0.47 | 0 |