Table 3 Subgroup analyses for the difference in HbA1c with peer support compared with usual care group
Study characteristics | No. of studies | Mean difference of HbA1c, % (95% CI) | Heterogeneity | |
|---|---|---|---|---|
P | I2(%) | |||
All studies | 13 | −0.57(−0.78 to −0.36) | <0.0001 | 80.0 |
Publication year | ||||
Before 2010 | 6 | −0.47(−0.76 to −0.17) | <0.0001 | 82.0 |
After 2011 | 7 | −0.68-1.05 to −0.31) | <0.0001 | 79.0 |
Study location | ||||
Medical institution | 8 | −0.71(−1.05 to −0.37) | <0.0001 | 77.0 |
Community or church | 5 | −0.41(−0.71 to −0.10) | <0.0001 | 84.0 |
HbA1c level at baseline* | ||||
≥ 8.5% | 5 | −0.78(−1.06 to −0.51) | 0.94 | 0.0 |
7.5% to 8.5% | 5 | −0.76(−1.05 to −0.47) | 0.003 | 75.0 |
<7.5% | 3 | −0.08(−0.32 to 0.16) | 0.09 | 59.0 |
Mode of peer support | ||||
Peer coach | 10 | −0.51(−0.75 to −0.27) | <0.0001 | 84.0 |
Community health worker | 3 | −0.82(−1.15 to −0.49) | 0.92 | 0.0 |
Type of peer support * | ||||
Individual | 4 | −0.91(−1.10 to −0.71) | 0.81 | 0.0 |
Group | 7 | −0.42(−0.72 to −0.11) | 0.0006 | 74.0 |
Both | 2 | −0.52(−0.66 to −0.38) | 0.30 | 8.0 |
Frequency of contact | ||||
High | 6 | −0.52(−0.60 to −0.44) | 0.68 | 0.0 |
Moderate | 3 | −0.75(−1.21 to −0.29) | 0.009 | 79.0 |
Low | 4 | −0.32(−0.74 to 0.09) | 0.002 | 80.0 |
Length of intervention | ||||
≦6 months | 8 | −0.64(−1.01 to −0.27) | <0.0001 | 85.0 |
>6 months | 5 | −0.51(−0.81to 0.20) | 0.004 | 74.0 |