Table 1– Patients’ anthropometric data, and medical and sleep history

Patient	Sex	Age yrs	Height cm	Weight kg	BMI kg·m⁻²	Comorbidities and risk factors	Previous surgical treatments
2^#	M	55	174	98	32	AHT, diabetes, smoker	2
3	M	53	168	76	27		1
4	M	54	187	105	30	AHT, diabetes, depressive symptoms	0
5	F	51	160	98	39	AHT, diabetes, breast cancer, smoker	0
6	M	40	161	83	32	CEA	0
7	M	56	186	86	25	GERD, smoker	1
8	M	64	171	95	32	Hypothyroidism, gout, chronic pain, osteoporosis, hypercholesterolaemia	1
9	M	27	173	84	28	Smoker	0
10	M	51	172	97	33	Urinary lithiasis, smoker	0
11	M	63	178	98	31	Smoker	1
12	M	58	160	70	27	GERD	1
13	M	47	177	98	31	Smoker, periodic leg movements, GERD, chronic back pain	1
14	M	46	187	94	27	GERD	0
15	M	39	184	112	33	Smoker, AHT, MI, hypercholesterolaemia, CABG, depressive symptoms	0

BMI: body mass index; M: male; F: female; AHT: arterial hypertension; CEA: congenital oesophageal atresia (corrected); GERD: gastro-oesophageal reflux; MI: myocardial infarction; CABG: coronary artery bypass graft.^#: in patient 1 the electrode lead broke early into the trial; he was re-operated on and was recorded as patient 9.