PRL and obstructive sleep apnea syndrome: Comparing OSA with ED and OSA without ED revealed that the secretion levels of prolactin (p=0.793), follicle-stimulating hormone (p=0.599), luteinizing hormone (p=0.676), progesterone (p=0.533), estrogen (p=0.682), and testosterone (p=0.431) in the OSA with ED group were not significantly different than those in the OSA without ED group.