Table 2 Quality of included studies
Study | Study purpose | Sampling technique | Sample Size | Assessement of lung function | COPD diagnostic criteria | Total score | Study quality |
|---|---|---|---|---|---|---|---|
Bourbeau et al. 2022 [29] | Clearly defined (1) | Hazards sampling (1) | n = 1452 (1) | Objective (1) | FR (2) | 6 | high quality |
Farooqi et al. 2022 [30] | Clearly defined (1) | Stratified random (1) | 21Â 242 (1) | Objective (1) | LLNÂ (1) | 5 | moderate quality |
Grafino et al. 2022 [31] | Clearly defined (1) | Not mentioned (0) | 241 (0) | Objective (1) | FR and LLN (2) | 4 | moderate quality |
Michiguchi et al. 2022 [32] | Clearly defined (1) | Not mentioned (0) | n = 4364 (1) | Objective (1) | FR (2) | 5 | moderate quality |
Pagano et al. 2022 [33] | Clearly defined (1) | Not mentioned (0) | 141 (0) | Objective (1) | FR (2) | 4 | moderate quality |
Wang et al. 2022 [34] | Clearly defined (1) | Hazards sampling (1) | n = 33 664 (1) | Objective (1) | FR (2) | 6 | high quality |
Xiao et al. 2022 [35] | Clearly defined (1) | Randomized (1) | n = 202 (0) | Objective (1) | FR (2) | 5 | moderate quality |
Kim et Kang 2021 [36] | Clearly defined (1) | Multi-stage complex randomness (1) | n = 12 919 (1) | Objective (1) | LLN (1) | 5 | moderate quality |
Leung et al. 2021 [37] | Clearly defined (1) | Rondomized (1) | n = 4893 (1) | Objective (1) | FR and LLN (2) | 6 | high quality |
Li et 2021 [38] | Clearly defined (1) | Random in clusters (1) | n =2963 (1) | Objective (1) | FR (2) | 6 | high quality |
Shanggaun et al. 2021 [39] | Clearly defined (1) | Multi-stage randomness (1) | n =2194 (1) | Objective (1) | FR (2) | 6 | high quality |
Su et al. 2021 [40] | Clearly defined (1) | Multi-stage randomness (1) | n =3407 (1) | Objective (1) | FR (2) | 6 | high quality |
Tamaki et al. 2021 [41] | Clearly defined (1) | Non-random (0) | n = 2518 (1) | Objective (1) | FR (2) | 5 | moderate quality |
Zhang et al. 2021 [42] | Clearly defined (1) | Multi-stage randomness (1) | n = 2421 (1) | Objective (1) | FR (2) | 6 | high quality |
Adhikari et al. 2020 [43] | Clearly defined (1) | Systemic randomness (1) | n =1438 (1) | Objective (1) | FR and LLN (2) | 6 | high quality |
Kim et al. 2020 [44] | Clearly defined (1) | Randomized (1) | n =6341 (1) | Objective (1) | FR (2) | 6 | high quality |
Melbye et al. 2020 [45] | Clearly defined (1) | Randomized (1) | n =7247 (1) | Objective (1) | LLN (1) | 5 | moderate quality |
Sharifi et al. 2020 [46] | Clearly defined (1) | Randomized (1) | n =1007 (1) | Objective (1) | FR (2) | 6 | high quality |
Sumit et al. 2020 [47] | Clearly defined (1) | Not mentioned (0) | n = 373 (1) | Objective (1) | FR (2) | 5 | moderate quality |
Timur et al. 2020 [48] | Clearly defined (1) | Not mentioned (0) | n = 386 (1) | Objective (1) | FR (2) | 5 | moderate quality |
Yan et al. 2020 [49] | Clearly defined (1) | Non-random (0) | n =4725 (1) | Objective (1) | FR (2) | 5 | moderate quality |
Bikbov et al. 2019 [50] | Clearly defined (1) | Randomized (1) | n =5392 (1) | Objective (1) | FR and LLN (2) | 6 | High quality |
De Matteis et al. 2019 [51] | Clearly defined (1) | Randomized (1) | n =94,551 (1) | Objective (1) | LLN (1) | 5 | moderate quality |
Sheng et al. 2019 [52] | Clearly defined (1) | Non-random (0) | n = 1371 (1) | Objective (1) | FR (2) | 5 | moderate quality |
Zha et al. 2019 [53] | Clearly defined (1) | Random, complex in several degrees (1) | n =2770 (1) | Objective (1) | FR and LLN (2) | 6 | high quality |
Brostrôm et al. 2018 [54] | Clearly defined (1) | Randomized (1) | n = 1993 (1) | Objective (1) | LLN (1) | 5 | moderate quality |
Ding et al. 2018 [55] | Clearly defined (1) | Not mentioned (0) | n =5637 (1) | Objective (1) | FR (2) | 5 | moderate quality |
Fang et al. 2018 [56] | Clearly defined (1) | Random, complex in several degrees (1) | n = 66,752 (1) | Objective (1) | FR (2) | 6 | high quality |
Leem et al. 2018 [57] | Clearly defined (1) | Randomized clustering in two stages (1) | n =6517(1) | Objective (1) | FR (2) | 6 | high quality |
Kotaki et al. 2017 [58] | Clearly defined (1) | Not mentioned (0) | n = 293 (0) | Objective (1) | FR (2) | 4 | moderate quality |
Nakaao et al. 2017 [59] | Clearly defined (1) | Non-random (0) | n = 746 (1) | Objective (1) | FR (2) | 5 | moderate quality |
Sobrino et al. 2017 [60] | Clearly defined (1) | Random, stratified at four degrees (1) | n =4345 (1) | Objective (1) | FR and LLN (2) | 6 | high quality |
Torén et al. 2017 [61] | Clearly defined (1) | Rondomized (1) | n = 1050 (1) | Objective (1) | FR and LLN (2) | 6 | high quality |
Denguizli et al. 2016 [62] | Clearly defined (1) | Stratified random (1) | n = 661 (1) | Objective (1) | FR and LLN (2) | 6 | high quality |
El Rhazi et al. 2016 [63] | Clearly defined (1) | Randomized (1) | n =768 (1) | Objective (1) | FR and LLN (2) | 6 | high quality |
Fukuyama et al. 2016 [64] | Clearly defined (1) | Not mentioned (0) | n = 2232 (1) | Objective (1) | FR (2) | 5 | moderate quality |
Karrash et al. 2016 [65] | Clearly defined (1) | Not mentioned (0) | n=Â 2256 (1) | Objective (1) | FR and LLN (2) | 5 | moderate quality |
Koul et al. 2016 [66] | Clearly defined (1) | Randomized (1) | n =757 (1) | Objective (1) | FR and LLN (2) | 6 | high quality |
Loh et al. 2016 [67] | Clearly defined (1) | Random simple stratified (1) | n = 663 (1) | Objective (1) | FR and LLN (2) | 6 | high quality |
Obaseki et al. 2016 [68] | Clearly defined (1) | Random in three stages (1) | n = 875 (1) | Objective (1) | LLN (1) | 5 | moderate quality |
Omori et al. 2016 [69] | Clearly defined (1) | Not mentioned (0) | n =22,293 (1) | Objectif (1) | FR (2) | 5 | moderate quality |
Park et al. 2016 [70] | Clearly defined (1) | Random, complex in several degrees (1) | n = 3283 (1) | Objective (1) | FR (2) | 6 | high quality |