Table 1.
Open in new tab

Basic characteristics of the included systematic reviews

Serial numberAuthorsTitleCountryNo of studies includedTypes of studies includedTotal population
1Chen et al., Oct 2012114Low vitamin D levels do not aggravate COVID-19 risk or death, and vitamin D supplementation does not improve outcomes in hospitalized patients with COVID-19: A meta-analysis and GRADE assessment of cohort studies and RCTsChina13Cohort studies = 11, Randomized control Trials = 25 36 418
2Grove et al., May 202115Association between vitamin D supplementation or serum vitamin D level and susceptibility to SARS-CoV-2 infection or COVID-19 including clinical course, morbidity and mortality outcomes? A systematic reviewUK4Cross-sectional study = 1, retrospective cohort study = 1, ecological country study = 1, case-control survey = 12042
3Hariyanto et al., June 202116Vitamin D supplementation and Covid-19 outcomes: A systematic review, meta-analysis and meta-regressionIndonesia11Retrospective cohort studies = 4, Open-label randomized clinical trial = 1, Prospective cohort studies = 2, Cross-sectional studies = 3, double-blind randomized clinical trial = 12265
4Nikniaz et al., Jan 202117The impact of vitamin D supplementation on mortality rate and clinical outcomes of COVID-19 patients: A systematic review and meta-analysisIran4Randomized control trials = 2, Quasi Experimental trials = 2259
5Pal et al., June 202118Vitamin D supplementation and clinical outcomes in COVID 19: a systematic review and meta-analysisIndia13Randomized control trials = 3, Observational studies = 102933
6Rawat et al., June 202119Vitamin D supplementation and COVID-19 treatment: A systematic review and meta-analysisIndia5Randomized control trials = 3, Quasi experimental studies = 2467
7Shah et al., May 202120Vitamin D supplementation, COVID-19 and disease severity: a meta-analysisIndia3Randomized control trials = 2, retrospective case-control study = 1532
8Stroehlein et al., May 202121Vitamin D supplementation for the treatment of COVID‐19: a living systematic reviewGermany3Randomized control trials = 3356
9Tentolouris et al., Dec 202122The effect of vitamin D supplementation on mortality and intensive care unit admission of COVID-19 patients. A systematic review, meta-analysis and meta-regressionGreece10Randomized control trials = 2, non-randomized trials = 82078
10Vaughan et al., Oct 202123Changes in 25‐hydroxyvitamin D levels post‐vitamin D supplementation in people of Black and Asian ethnicities and its implications during COVID‐19 pandemic: A systematic reviewUK8Randomized control trials = 81108
Serial numberAuthorsTitleCountryNo of studies includedTypes of studies includedTotal population
1Chen et al., Oct 2012114Low vitamin D levels do not aggravate COVID-19 risk or death, and vitamin D supplementation does not improve outcomes in hospitalized patients with COVID-19: A meta-analysis and GRADE assessment of cohort studies and RCTsChina13Cohort studies = 11, Randomized control Trials = 25 36 418
2Grove et al., May 202115Association between vitamin D supplementation or serum vitamin D level and susceptibility to SARS-CoV-2 infection or COVID-19 including clinical course, morbidity and mortality outcomes? A systematic reviewUK4Cross-sectional study = 1, retrospective cohort study = 1, ecological country study = 1, case-control survey = 12042
3Hariyanto et al., June 202116Vitamin D supplementation and Covid-19 outcomes: A systematic review, meta-analysis and meta-regressionIndonesia11Retrospective cohort studies = 4, Open-label randomized clinical trial = 1, Prospective cohort studies = 2, Cross-sectional studies = 3, double-blind randomized clinical trial = 12265
4Nikniaz et al., Jan 202117The impact of vitamin D supplementation on mortality rate and clinical outcomes of COVID-19 patients: A systematic review and meta-analysisIran4Randomized control trials = 2, Quasi Experimental trials = 2259
5Pal et al., June 202118Vitamin D supplementation and clinical outcomes in COVID 19: a systematic review and meta-analysisIndia13Randomized control trials = 3, Observational studies = 102933
6Rawat et al., June 202119Vitamin D supplementation and COVID-19 treatment: A systematic review and meta-analysisIndia5Randomized control trials = 3, Quasi experimental studies = 2467
7Shah et al., May 202120Vitamin D supplementation, COVID-19 and disease severity: a meta-analysisIndia3Randomized control trials = 2, retrospective case-control study = 1532
8Stroehlein et al., May 202121Vitamin D supplementation for the treatment of COVID‐19: a living systematic reviewGermany3Randomized control trials = 3356
9Tentolouris et al., Dec 202122The effect of vitamin D supplementation on mortality and intensive care unit admission of COVID-19 patients. A systematic review, meta-analysis and meta-regressionGreece10Randomized control trials = 2, non-randomized trials = 82078
10Vaughan et al., Oct 202123Changes in 25‐hydroxyvitamin D levels post‐vitamin D supplementation in people of Black and Asian ethnicities and its implications during COVID‐19 pandemic: A systematic reviewUK8Randomized control trials = 81108
Table 1.
Open in new tab

Basic characteristics of the included systematic reviews

Serial numberAuthorsTitleCountryNo of studies includedTypes of studies includedTotal population
1Chen et al., Oct 2012114Low vitamin D levels do not aggravate COVID-19 risk or death, and vitamin D supplementation does not improve outcomes in hospitalized patients with COVID-19: A meta-analysis and GRADE assessment of cohort studies and RCTsChina13Cohort studies = 11, Randomized control Trials = 25 36 418
2Grove et al., May 202115Association between vitamin D supplementation or serum vitamin D level and susceptibility to SARS-CoV-2 infection or COVID-19 including clinical course, morbidity and mortality outcomes? A systematic reviewUK4Cross-sectional study = 1, retrospective cohort study = 1, ecological country study = 1, case-control survey = 12042
3Hariyanto et al., June 202116Vitamin D supplementation and Covid-19 outcomes: A systematic review, meta-analysis and meta-regressionIndonesia11Retrospective cohort studies = 4, Open-label randomized clinical trial = 1, Prospective cohort studies = 2, Cross-sectional studies = 3, double-blind randomized clinical trial = 12265
4Nikniaz et al., Jan 202117The impact of vitamin D supplementation on mortality rate and clinical outcomes of COVID-19 patients: A systematic review and meta-analysisIran4Randomized control trials = 2, Quasi Experimental trials = 2259
5Pal et al., June 202118Vitamin D supplementation and clinical outcomes in COVID 19: a systematic review and meta-analysisIndia13Randomized control trials = 3, Observational studies = 102933
6Rawat et al., June 202119Vitamin D supplementation and COVID-19 treatment: A systematic review and meta-analysisIndia5Randomized control trials = 3, Quasi experimental studies = 2467
7Shah et al., May 202120Vitamin D supplementation, COVID-19 and disease severity: a meta-analysisIndia3Randomized control trials = 2, retrospective case-control study = 1532
8Stroehlein et al., May 202121Vitamin D supplementation for the treatment of COVID‐19: a living systematic reviewGermany3Randomized control trials = 3356
9Tentolouris et al., Dec 202122The effect of vitamin D supplementation on mortality and intensive care unit admission of COVID-19 patients. A systematic review, meta-analysis and meta-regressionGreece10Randomized control trials = 2, non-randomized trials = 82078
10Vaughan et al., Oct 202123Changes in 25‐hydroxyvitamin D levels post‐vitamin D supplementation in people of Black and Asian ethnicities and its implications during COVID‐19 pandemic: A systematic reviewUK8Randomized control trials = 81108
Serial numberAuthorsTitleCountryNo of studies includedTypes of studies includedTotal population
1Chen et al., Oct 2012114Low vitamin D levels do not aggravate COVID-19 risk or death, and vitamin D supplementation does not improve outcomes in hospitalized patients with COVID-19: A meta-analysis and GRADE assessment of cohort studies and RCTsChina13Cohort studies = 11, Randomized control Trials = 25 36 418
2Grove et al., May 202115Association between vitamin D supplementation or serum vitamin D level and susceptibility to SARS-CoV-2 infection or COVID-19 including clinical course, morbidity and mortality outcomes? A systematic reviewUK4Cross-sectional study = 1, retrospective cohort study = 1, ecological country study = 1, case-control survey = 12042
3Hariyanto et al., June 202116Vitamin D supplementation and Covid-19 outcomes: A systematic review, meta-analysis and meta-regressionIndonesia11Retrospective cohort studies = 4, Open-label randomized clinical trial = 1, Prospective cohort studies = 2, Cross-sectional studies = 3, double-blind randomized clinical trial = 12265
4Nikniaz et al., Jan 202117The impact of vitamin D supplementation on mortality rate and clinical outcomes of COVID-19 patients: A systematic review and meta-analysisIran4Randomized control trials = 2, Quasi Experimental trials = 2259
5Pal et al., June 202118Vitamin D supplementation and clinical outcomes in COVID 19: a systematic review and meta-analysisIndia13Randomized control trials = 3, Observational studies = 102933
6Rawat et al., June 202119Vitamin D supplementation and COVID-19 treatment: A systematic review and meta-analysisIndia5Randomized control trials = 3, Quasi experimental studies = 2467
7Shah et al., May 202120Vitamin D supplementation, COVID-19 and disease severity: a meta-analysisIndia3Randomized control trials = 2, retrospective case-control study = 1532
8Stroehlein et al., May 202121Vitamin D supplementation for the treatment of COVID‐19: a living systematic reviewGermany3Randomized control trials = 3356
9Tentolouris et al., Dec 202122The effect of vitamin D supplementation on mortality and intensive care unit admission of COVID-19 patients. A systematic review, meta-analysis and meta-regressionGreece10Randomized control trials = 2, non-randomized trials = 82078
10Vaughan et al., Oct 202123Changes in 25‐hydroxyvitamin D levels post‐vitamin D supplementation in people of Black and Asian ethnicities and its implications during COVID‐19 pandemic: A systematic reviewUK8Randomized control trials = 81108
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