| http://www.w3.org/ns/prov#value | - We controlled for potential confounding variables including age, gender, severity of kidney disease (as determined by the 3 study groups), sleep restriction (defined as spending < 6 h in bed at night), alcohol and caffeine intake, cigarette smoking, and comorbidities that could disrupt sleep (sleep apnea, congestive heart failure, cerebrovascular disease, and COPD).
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