The study you linked was based on a threshold of 50 nmol/L, while the originally posted study used two thresholds, 30 nmol/L and 50 nmol/L. At the 50 nmol/L cutoff, the study you linked indicates a deficiency rate of 41.6% for the general population, compared to a rate of 91.3% among psychiatric patients according to the posted study.
I’d still take the posted study with a grain of salt. Vitamin D deficiency between individuals is likely to be highly correlated within a particular region and time period due to its dependence on weather, and the authors didn’t control for that. But they did say that this was just a pilot, and given the effect size it’s probably worth investigating further.
I’d still take the posted study with a grain of salt. Vitamin D deficiency between individuals is likely to be highly correlated within a particular region and time period due to its dependence on weather, and the authors didn’t control for that. But they did say that this was just a pilot, and given the effect size it’s probably worth investigating further.
Edit: fixed units