Comparison 2. Repair with acromioplasty versus repair only.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1 Pain (0 to 10, 0 is best)	2		Mean Difference (IV, Random, 95% CI)	Subtotals only
1.1 6 months	2	215	Mean Difference (IV, Random, 95% CI)	0.20 [‐0.98, 1.37]
1.2 12 months	2	215	Mean Difference (IV, Random, 95% CI)	‐0.61 [‐1.00, ‐0.21]
1.3 >12 months	2	215	Mean Difference (IV, Random, 95% CI)	0.01 [‐0.48, 0.49]
2 Function (0 to 100, 100 is best)	5		Std. Mean Difference (IV, Random, 95% CI)	Subtotals only
2.1 6 months	3	280	Std. Mean Difference (IV, Random, 95% CI)	0.19 [‐0.05, 0.42]
2.2 12 months	4	361	Std. Mean Difference (IV, Random, 95% CI)	0.13 [‐0.07, 0.34]
2.3 >12 months	4	352	Std. Mean Difference (IV, Random, 95% CI)	0.25 [0.04, 0.47]
3 Repair failure	1		Risk Ratio (M‐H, Random, 95% CI)	Totals not selected
4 Adverse events	1		Risk Ratio (M‐H, Random, 95% CI)	Totals not selected
5 Subgroup analysis by acromion type for pain at 2 years	1		Mean Difference (IV, Random, 95% CI)	Subtotals only
5.1 Type I	1	10	Mean Difference (IV, Random, 95% CI)	‐0.5 [‐2.55, 1.55]
5.2 Type II	1	57	Mean Difference (IV, Random, 95% CI)	0.5 [‐0.28, 1.28]
5.3 Type III	1	19	Mean Difference (IV, Random, 95% CI)	0.10 [‐0.53, 0.73]
6 Subgroup analysis by acromion type for function at 2 years (various measures 0 to 100, higher is better)	2		Mean Difference (IV, Random, 95% CI)	Subtotals only
6.1 Type I	2	22	Mean Difference (IV, Random, 95% CI)	‐8.21 [‐23.55, 7.14]
6.2 Types II	2	107	Mean Difference (IV, Random, 95% CI)	0.97 [‐5.10, 7.05]
6.3 Type III	2	39	Mean Difference (IV, Random, 95% CI)	2.32 [‐9.96, 14.61]