https://www.selleckchem.com/pr....oducts/cdk2-inhibito
After controlling for individual-level factors, geographic variation accounted for 4.00% and 13.67% of overall variance in short and long sleep duration, respectively; the corresponding estimates for difficulty initiating and maintaining sleep, daytime sleepiness, and finding sleep refreshing were 3.04%, 3.80%, and 5,08%, respectively. CONCLUSIONS There is a significant level of geographic variation in short and long sleep duration and sleep quality and this variation cannot be accounted for by differential distribution of ind