Comparison 2. pulmonary function.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1 Percentage change in vital capacity day 1 post‐operative	5	263	Mean Difference (IV, Fixed, 95% CI)	8.08 [5.06, 11.10]
2 Percentage change in vital capacity on day 7	5	210	Mean Difference (IV, Fixed, 95% CI)	7.10 [3.21, 10.99]
3 Percentage change in FEV1 day 1 post‐operative	4	244	Mean Difference (IV, Fixed, 95% CI)	7.27 [2.90, 11.64]
4 Percentage change in FEV1 last day of measurement	3	140	Mean Difference (IV, Fixed, 95% CI)	9.97 [3.46, 16.48]