25 May 2022>: Meta-Analysis
Effect of the COVID-19 Pandemic on Serum Vitamin D Levels in People Under Age 18 Years: A Systematic Review and Meta-Analysis
Xian Cui 1ABCDEF** , Yuhang Zhai 2CE* , Shuai Wang 1BF , Ke Ding 1E , Zhenya Yang 1E , Yan Tian 1D , Tingting Huo 1DDOI: 10.12659/MSM.935823
Med Sci Monit 2022; 28:e935823
Table 1 Characteristics of the included studies.
Study included | Country | Study design | Sample size | Age (means±SD) | % of males | Definition of pre-COVID-19 | Definition of COVID-19 period |
---|---|---|---|---|---|---|---|
Kang et al, 2020 | Korea | Retrospective | 226 | 10.5 (8.7–12.4) years* | 42.5 | 3, 2019–3, 2021 | 3–9, 2020 |
Feketea et al, 2021 | Greece | Prospective | 340 | 8.6±4.6 years | 45.6 | 2, 2019–12, 2019 | 1, 2020–1, 2021 |
Wong et al, 2021 | Hong Kong | Retrospective | 303 | 10.42±6.37 months | 48.5 | 6–12, 2019 | 6–12, 2020 |
Rustecka et al, 2021 | Poland | Retrospective | 1472 | 8.0±5.0 years | 52.1 | 1–12, 2019 | 1, 2020–2, 2021 |
Yu et al, 2020 | China | Retrospective | 1800 | 29.0±23.0 months | NA | 1–12, 2019 | 1–12, 2020 |
SD – standard deviation; NA – not available. * Range of age. |