|
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
|
- Note: CI = confidence interval; *p <0.05 (subgroup difference).
