Table 3 Subgroup analysis of left ventricle ejection fraction according to study characteristics
Group | No. of study | SMD (95% CI) | Z-value | p value | I2% (p) | Q (p) |
|---|---|---|---|---|---|---|
All studies | 6 | − 0.43 (− 0.67 to − 0.18) | − 3.43 | 0.001 | 71.4 (0.004) |  |
Publication year | Â | Â | Â | Â | Â | Â |
Before 2010 | 2 | − 0.50 (− 0.80 to − 0.20) | − 3.28 | 0.001 | 0 (0.342) | 0.58 (0.448) |
After 2010 | 4 | − 0.40 (− 0.72 to − 0.07) | − 2.38 | 0.017 | 81.2 (0.001) |  |
No. of participants | Â | Â | Â | Â | Â | Â |
 ≥ 200 | 2 | − 0.36 (− 0.93 to 0.21) | − 1.24 | 0.217 | 91.8 (< 0.001) | 1.65 (0.199) |
 < 200 | 4 | − 0.48 (− 0.69 to − 0.27) | − 4.54 |  < 0.001 | 15.8 (0.313) |  |
Study location | Â | Â | Â | Â | Â | Â |
Europe | 2 | − 0.16 (− 0.42 to 0.10) | − 1.21 | 0.228 | 31.2 (0.228) | 12.26 (< 0.001) |
Asia | 4 | − 0.57 (− 0.76 to − 0.39) | − 6.04 |  < 0.001 | 20.0 (0.289) |  |