Case control study examining medication usage with a healthcare database in Israel, showing lower risk of hospitalization with vitamin D (defined as being picked up within 35 days prior to PCR+). Other patients may have acquired vitamin D supplements outside of the healthcare system.
Israel et al., 7/27/2021, retrospective, Israel, Middle East, peer-reviewed, 10 authors, dosage not specified.
risk of hospitalization, 9.1% lower, RR 0.91, p = 0.003, treatment 737 of 2406 (30.6%), control 6216 of 18453 (33.7%), odds ratio converted to relative risk, PCR+, cohort 2.
Effect extraction follows pre-specified rules
prioritizing more serious outcomes. For an individual study the most serious
outcome may have a smaller number of events and lower statistical signficance,
however this provides the strongest evidence for the most serious outcomes
when combining the results of many trials.