Table 2. Eligible studies.

AuthorReferenceCohortNo. of PatientsLaboratory Results Recorded Pre-/Post-InfectionMortalityVitamin D Level [ng/mL]
Ahmad et al., 2021[142]19 European countries448,785,546Up to 10 months in advanceRefer to source study
Angelidi et al., 2021[159]<30 ng/mL79Within 1 day after admission25.30%NR a
Median (IQR): 28 ng/mL (16.80–39.00 ng/mL)
≥30 ng/mL659.20%
Charoenngam et al., 2021[160]<20 ng/mL96Up to 1 year in advance14.58%NR a
20–30 ng/mL9116.48%
≥30 ng/mL10012.00%
Gavioli et al., 2021[126]Deficient177Up to 3 months in advance29.00%14.00
31.00
Sufficient26031.00%
Susianti et al., 2021[161]<49.92 nmol/L42Within 1 day after admission45.00%8.00
28.40
≥49.92 nmol/L842.00%
Szeto et al., 2021[127]<20 ng/mL35Up to 12 months in advance23.00%16.00
32.00
≥20 ng/mL5824.00%
Vanegas-Cedillo et al., 2021[115]≤20 ng/mL251Within 1 day after admission23.50%NR a
Mean ± SD 21.78 ± 9.01 ng/ml
>20 ng/mL30019.00%
Vassiliou, 2020[120]≤19.9 ng/mL32Within 1 day after admission25.00%NR a
20–29.9 ng/mL714.30%

a Not reported.