Table 3
Results of the subgroup analysis
Area
Studies (n)
Comparison model
OR
95% CI
Southern
2
C vs T
1.64
0.50 to 5.37
2
CC vs TT
1.40
0.27 to 7.14
2
CT+CC vs TT
1.06
0.40 to 2.80
2
CC vs CT+TT
1.72
0.48 to 6.14
CI, confidence interval; OR, odd ratio.