**Fig. (2)** **Test characteristics of the Epworth Sleepiness Scale (ESS) in the diagnosis of obstructive sleep apnea (OSA), related to
gender, ethnicity, and body mass index.** (**A**) The sensitivity and specificity of the ESS for the diagnosis of OSA are plotted for the overall
study population (N = 1900), males (N = 1092), females (N = 805), Caucasians (N = 998), Hispanics (N = 856), other races (N = 46), obese
(N = 1370), and non-obese (N = 529). (**B**) The sensitivity and specificity of the ESS for the diagnosis of OSA are plotted for obese Caucasian
males (OCM, N = 397), non-obese Caucasian males (NCM, N = 198), obese Hispanic males (OHM, N = 364), non-obese Hispanic males
(NHM, N = 104), obese Caucasian females (OCF, N = 269), non-obese Caucasian females (NCF, N = 130), obese Hispanic females (OHF, N
= 303), and non-obese Hispanic females (NHF, N = 82).