Table 3 Subgroup analyses for primary outcome of HbA1c
Subgroup | No. of studies | Pooled mean differences(95% CI) | P for heterogeneity | I2(%) |
|---|---|---|---|---|
Country | ||||
 United states | 3 | -0.48[-0.71, -0.25] | 0.14 | 50 |
 Others | 4 | -0.36[-0.64, -0.07] | <0.001 | 80 |
Sample size | ||||
 < 250 | 4 | -0.38[-0.79, 0.02] | <0.001 | 84 |
 >= 250 | 3 | -0.41[-0.63, -0.18] | <0.001 | 68 |
Characteristics | ||||
 T2D | 4 | -0.33[-0.44, -0.22] | 0.91 | 0 |
 Special adults with T2D | 3 | -0.49[-0.97, -0.00] | <0.001 | 91 |
Quality | ||||
 Low | 4 | -0.44[-0.74, -0.15] | 0.02 | 65 |
 High | 3 | -0.33[-0.62, -0.03] | <0.001 | 91 |