The Effect of Zinc Supplementation on Sleep Quality of ICU Nurses: A Double Blinded Randomized Controlled Trial.

What Was Tested

The paper reports a study of Vitamin D, K2, Magnesium and Zinc, published as a randomized controlled trial.

This study examined the effect of zinc supplementation on the sleep quality (SQ) of intensive care unit (ICU) nurses.

The serum zinc level was a secondary outcome.

Who Took Part

PubMed indexes the participants as adults, both men and women.

How the Study Was Run

The researchers set it up as a randomized, double-blind and placebo-controlled study.

Because people in this Vitamin D, K2, Magnesium and Zinc study were split into groups at random, differences between the groups are less likely to reflect who happened to join each one.

Neither the participants nor the staff measuring them knew who was on Vitamin D, K2, Magnesium and Zinc, so expectations could not easily colour the readings.

The comparison arm used a placebo, so changes seen with Vitamin D, K2, Magnesium and Zinc could be set against what happens without it.

Sleep quality of ICU nurses was measured by calculating the total quality sleep score using the Pittsburgh Sleep Quality Index (PSQI).

What Was Measured

The serum zinc level was a secondary outcome.

The subject headings attached to it are Astringents, Chi-Square Distribution, Dietary Supplements, Intensive Care Units, Iran, Nurses and Psychometrics.

Author keywords: PSQI, intensive care unit (ICU), nursing, nutrition, sleep quality and zinc supplement.

What This Means in Plain Language

The paper is a randomized, double-blind and placebo-controlled study of Vitamin D, K2, Magnesium and Zinc.

The publication is from 2018 (Workplace health & safety), a journal based in United States.

More context: the Vitamin D, K2, Magnesium and Zinc compound page, all human trials.