Table 1.
Basic characteristics of the included literature.
| Author | Year of publication | Research site | Sample size (test group/comparison group) | Age (years) | Gender (male/female) | Follow-up time (months) |
|---|---|---|---|---|---|---|
| [8] | 2016 | Shanghai | 30/30 | 56.78 ± 4.32 | 30/30 | 6 |
| [9] | 2018 | Henan province | 57/57 | 63.43 ± 7.92 | 63/51 | 1 |
| [10] | 2016 | Guangzhou city | 40/40 | 56.30 ± 1.40 | 43/37 | 12 |
| [11] | 2017 | Shenzhen | 41/41 | 59.14 ± 10.88 | 45/37 | 6 |
| [12] | 2020 | Shenzhen | 49/49 | 64.60 ± 2.70 | 69/29 | 3 |
| [2] | 2017 | Shaanxi province | 40/40 | 71.3 ± 10.4 | 49/33 | 6 |
| Bunny Pozehl | 2015 | United Kingdom | 30/30 | 68.60 ± 8.50 | 35/25 | 3 |
| [5] | 2017 | United States | 61/60 | 64.3 ± 11.7 | 63/58 | 6 |
| [1] | 2019 | Shandong | 37/20 | 68.10 ± 1.14 | 41/16 | 3 |