Continuous outcomes
| Number of studies | BGC | No BGC | Mean difference (95% CI) | p Value | I2 | |
| Mean number of passes (SD) | 4 | 1.7 (1.6 to 1.8) | 2.0 (1.9 to 2.2) | −0.34 (−0.47 to −0.22) | <0.01 | 66% |
| Mean procedure time, min (SD) | 4 | 70.5 (37.5 to 103.5) | 90.9 (47.1 to 134.7) | −7.7 (−9.0 to −6.4) | <0.01 | 98% |