Meltzer, 4,258 patient vitamin D sufficiency study: 35% fewer cases [p=0.11] https://c19p.org/meltzer2
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Association of Vitamin D Levels, Race/Ethnicity, and Clinical Characteristics With COVID-19 Test Results
et al., JAMA Netw Open., doi:10.1001/jamanetworkopen.2021.4117
Retrospective 4,638 individuals with vitamin D levels within 1 year before COVID-19 testing, showing higher risk of COVID-19 PCR+ for vitamin D deficient individuals, and lower (but not statistically significant) cases for individuals using vitamin D supplementation.
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risk of case, 34.6% lower, RR 0.65, p = 0.11, high D levels 61 of 1,097 (5.6%), low D levels 118 of 1,251 (9.4%), NNT 26, adjusted per study, >40ng/mL vs. <20ng/mL, Table 2, Model 2.
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risk of case, 36.0% lower, RR 0.64, p = 0.38, high D levels 6 of 131 (4.6%), low D levels 239 of 3,338 (7.2%), NNT 39, supplementation, >=2,000IU/d.
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risk of case, 31.1% lower, RR 0.69, p = 0.16, high D levels 15 of 304 (4.9%), low D levels 239 of 3,338 (7.2%), NNT 45, supplementation, >=1,001IU/d.
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risk of case, 8.9% lower, RR 0.91, p = 0.56, high D levels 60 of 920 (6.5%), low D levels 239 of 3,338 (7.2%), NNT 157, supplementation, >=1IU/d.
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| Effect extraction follows pre-specified rules prioritizing more serious outcomes. Submit updates |
Meltzer et al., 3/19/2021, retrospective, database analysis, USA, North America, peer-reviewed, 6 authors.
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