| Outcomes | Deletion | Result |
| SGRQ | Li XY 2014 | | MD-12.05, 95% CI [-21.93, -2.16] | Yun X 2015 | | MD-6.61, 95% CI [-12.18, -1.03] | Li F 2015 | | MD-7.80, 95% CI [-15.10, -0.51] | Zhang ZH 2012 | | MD-12.00, 95% CI [-22.09, -1.90] |
| FVC | Yun X 2015 | | MD0.16, 95% CI [-0.01, 0.33] | Ma LL 2014 | | MD0.22, 95% CI [0.16, 0.29] | Pan W2017 | | MD0.15, 95% CI [-0.08, 0.37] |
| FEV1 | Liu J 2015 | | MD0.24, 95% CI [0.04, 0.45] | Qu WJ 2017 | | MD0.24, 95% CI [0.04, 0.44] | Liu CZ 2014 | | MD0.18, 95% CI [0.04, 0.32] | Ma LL 2014 | | MD0.29, 95% CI [0.17, 0.41] | Pan W2017 | | MD0.20, 95% CI [0.03, 0.37] |
| FEV1% | Li XY 2014 | | MD6.03, 95% CI [2.63, 9.43] | Li F 2015 | | MD3.61, 95% CI [1.66, 5.57] | Liu CZ 2014 | | MD4.94, 95% CI [0.75, 9.14] | Liu QG 2009 | | MD5.72, 95% CI [1.71, 9.74] | Ma LL 2014 | | MD4.83, 95% CI [0.71, 8.95] | Xiao SY 2019 | | MD5.49, 95% CI [1.16, 9.82] |
| FEV1/FVC | Qu WJ 2017 | | MD4.24, 95% CI [-3.37, 11.84] | Yun X 2015 | | MD4.39, 95% CI [-3.05, 11.82] | Jin YK 2014 | | MD3.63, 95% CI [-4.47, 11.72] | Li F 2015 | | MD1.67, 95% CI [-0.79, 4.13] | Liu CZ 2014 | | MD3.50, 95% CI [-4.76, 11.76] | Liu J 2015 | | MD5.29, 95% CI [-2.72, 13.31] | Xiao SY 2019 | | MD5.37, 95% CI [-2.60, 13.34] |
| MVV | Li XY 2014 | | MD5.87, 95% CI [1.26, 10.49] | Liu J 2015 | | MD3.38, 95% CI [0.07, 6.69] | Qu WJ 2017 | | MD3.38, 95% CI [0.07, 6.68] | Zhang ZH 2012 | | MD5.57, 95% CI [0.38, 10.76] |
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