Comparison 6. Other complications.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1 Seldinger (subclavian & IJ) versus venous cutdown (cephalic vein) ITT	7	1006	Odds Ratio (M‐H, Fixed, 95% CI)	0.59 [0.18, 1.96]
2 Seldinger (subclavian vein) versus venous cutdown (cephalic vein) ITT	5	672	Odds Ratio (M‐H, Fixed, 95% CI)	0.59 [0.18, 1.96]
3 Seldinger (IJ vein) versus venous cutdown (cephalic vein) ITT	2	367	Odds Ratio (M‐H, Fixed, 95% CI)	0.0 [0.0, 0.0]
4 Seldinger (subclavian & IJ) versus venous cutdown (cephalic vein). On‐treatment analysis	7	938	Odds Ratio (M‐H, Fixed, 95% CI)	0.64 [0.19, 2.14]
5 Seldinger (subclavian vein) versus venous cutdown (cephalic vein). On‐treatment analysis	5	618	Odds Ratio (M‐H, Fixed, 95% CI)	0.64 [0.19, 2.14]
6 Seldinger (IJ vein) versus venous cutdown (cephalic vein). On‐treatment analysis	2	332	Odds Ratio (M‐H, Fixed, 95% CI)	0.0 [0.0, 0.0]