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0 0.5 1 1.5 2+ Case 56% Improvement Relative Risk c19early.com/va Holt et al. NCT04330599 Vitamin A Prophylaxis Favors vitamin A Favors control
Holt, 15,227 patient vitamin A prophylaxis study: 56% fewer cases [p=0.41] https://c19p.org/holta
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Risk factors for developing COVID-19: a population-based longitudinal study (COVIDENCE UK)
30 Mar 2021    Source   PDF   Share   Tweet
Prospective survey-based study with 15,227 people in the UK, showing lower risk of COVID-19 cases with vitamin A, vitamin D, zinc, selenium, probiotics, and inhaled corticosteroids; and higher risk with metformin and vitamin C. Statistical significance was not reached for any of these. Except for vitamin D, the results for treatments we follow were only adjusted for age, sex, duration of participation, and test frequency. NCT04330599. COVIDENCE UK.
risk of case, 56.3% lower, RR 0.44, p = 0.41, treatment 1 of 91 (1.1%), control 445 of 15,136 (2.9%), NNT 54, adjusted per study, odds ratio converted to relative risk, minimally adjusted, group sizes approximated.
Effect extraction follows pre-specified rules prioritizing more serious outcomes. Submit updates
This study is excluded in the after exclusion results of meta analysis: significant unadjusted confounding possible.
Holt et al., 3/30/2021, prospective, United Kingdom, Europe, peer-reviewed, 34 authors, study period 1 May, 2020 - 5 February, 2021, trial NCT04330599.
Contact: a.martineau@qmul.ac.uk.
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