showed a trendp =0.057
However, in a subsequent cohort study, we observed that COVID-19 patients with 25(OH)D levels <10 ng/mL showed a trend ( p =0.057) of longer length of hospital stay than those with 25(OH)D levels ≥10 ng/mL (95% confidence interval [CI]: 6.4-11.6 days versus 6.6-7.4 days) ( 8 ).