Table 2.

Estimates and 95% confidence intervals obtained in a leave-one-out sensitivity analysis. The calculations are performed as in the main analysis. However, in each round of the sensitivity analysis one study is not included.

	Estimate Random Effect (95% CI)	Estimate Pooled (95% CI)
All studies included	0.077 (0.018; 0.167)	0.110 (0.085; 0.134)
Without Kriplani (2001) [6]	0.071 (0.007; 0.188)	0.111 (0.085; 0.137)
Without Salah (2013) [7]	0.056 (0.006; 0.145)	0.092 (0.067; 0.117)
Without Zahiri Sorouri (2014) [28]	0.101 (0.030; 0.204)	0.128 (0.100; 0.157)
Without El-Sayed (2017) [29]	0.101 (0.030; 0.204)	0.128 (0.100; 0.157)
Without Hager (2019)	0.059 (0.004; 0.159)	0.079 (0.053; 0.106)