“…The most frequently studied patients were those with Obstructive Sleep Apnea - Hypopnea Syndrome (OSAHS) (22) 53 , 54 , 58 – 62 , 64 – 69 , 74 , 75 , 79 , 81 , 86 , 87 , 90 , 94 , 97 , 98 and obesity (13) 52 , 71 , 73 , 80 , 82 – 85 , 91 , 92 , 95 , 99 , 100 ; other diseases included HIV/AIDS, sleep disorders, bronchiectasis, depression, stroke, epilepsy, hepatic and cardiovascular pathologies. The instrument or methodology to measure NC was reported in 29 studies 54 – 57 , 60 , 63 , 65 – 67 , 69 – 71 , 73 , 77 , 80 – 82 , 84 , 86 , 88 – 93 , 95 , 97 , 99 , 100 . We found 1 report 53 , which contributed with 2 estimates (e.g., one report provided more than one set of estimates).…”