Table 5.

Estimation of the publication bias (explanation in the text)

StudiesRR (95% CI)Test for overall effect (P)Test for heterogeneity (P)
All1.42 (1.32-1.52)<0.000010.38
All + 1 simulated negative1.41 (1.31-1.51)<0.000010.40
All + 2 simulated negative1.40 (1.31-1.50)<0.000010.45
All + 3 simulated negative1.39 (1.30-1.49)<0.000010.49
All + 4 simulated negative1.39 (1.29-1.49)<0.000010.53
All + 5 simulated negative1.38 (1.29-1.48)<0.000010.57
All + 7 simulated negative1.37 (1.28-1.47)<0.000010.63
All + 10 simulated negative1.36 (1.26-1.45)<0.000010.72