Table 1.

ROB2 assessment for each randomized clinical trial regarding the association of vitamin D supplementation with ICU admission and risk of death. Green indicates a low risk of bias; yellow indicates some concerns for risk of bias; red indicates a high risk of bias.

ROB2: A Revised Cochrane Risk-of-Bias Tool for Randomized Trials
	R	D	Mi	Me	S	O
Sabico (2021) [32]
Castillo (2020) [36]
Torres (2022) [37]
Murai (2021) [26]
Nogues (2021) [38]

Legend: R—bias arising from the randomization process; D—bias due to deviations from intended interventions; Mi—bias due to missing outcome data; Me—bias in measurement of the outcome; S—bias in selection of the reported results; O—overall risk of bias; + low risk of bias; − high risk of bias; ? some concerns.