In a multiple Poisson regression model (see Table 3), frequent angina was correlated with older age (p <.001), white race (p <.001) or other races compared with black (p <.001), higher BMI (p <.001), higher SBP (p =.002), insulin use (p =.045), history of coronary angioplasty (p <.001), shorter sleep duration (p =.033), longer sleep duration in supine position (p <.001), higher sleep efficiency (p =.009) and higher apnea-hypopnea index (p =.047). Here, INS is linked to angina pectoris.