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. 2018 Oct 11;2018(10):CD008001. doi: 10.1002/14651858.CD008001.pub2

Comparison 1. Ball versus bar attachment systems.

Outcome or subgroup title No. of studies No. of participants Statistical method Effect size
1 Success (short term; 1 to 3 years) 2   Risk Ratio (M‐H, Fixed, 95% CI) Subtotals only
2 Re‐treatment (repair) (short term; 1 to 3 years) 2 130 Risk Ratio (M‐H, Fixed, 95% CI) 3.11 [1.68, 5.75]
3 Re‐treatment (replace) (short term; 1 to 3 years) 2 130 Risk Ratio (M‐H, Fixed, 95% CI) 1.18 [0.38, 3.71]