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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 1D

DOI: 10.12659/MSM.935823

Med Sci Monit 2022; 28:e935823

Table 1 Characteristics of the included studies.

Study includedCountryStudy designSample sizeAge (means±SD)% of malesDefinition of pre-COVID-19Definition of COVID-19 period
Kang et al, 2020KoreaRetrospective22610.5 (8.7–12.4) years* 42.53, 2019–3, 20213–9, 2020
Feketea et al, 2021GreeceProspective3408.6±4.6 years45.62, 2019–12, 20191, 2020–1, 2021
Wong et al, 2021Hong KongRetrospective30310.42±6.37 months48.56–12, 20196–12, 2020
Rustecka et al, 2021PolandRetrospective14728.0±5.0 years52.11–12, 20191, 2020–2, 2021
Yu et al, 2020ChinaRetrospective180029.0±23.0 monthsNA1–12, 20191–12, 2020
SD – standard deviation; NA – not available.
* Range of age.

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Medical Science Monitor eISSN: 1643-3750
Medical Science Monitor eISSN: 1643-3750