TABLE 3.

Cardiovascular death incidence rates in usage and non-usage intervals of patients in different randomisation groups

	Persons	Person-years	Cardiovascular death events	Incidence rate per 100 person-years (95% CI)
Patients starting without ASV use
Randomised to control	637	2002.47	156	7.79 (6.66–9.11)
Randomised to ASV (“early  crossover” to control)	53	143.22	14	9.78 (5.79–16.51)
Patients starting with ASV use
Randomised to control  (“early crossover” to ASV)	22	65.68	2	3.05 (0.76–12.18)
Randomised to ASV	613	1814.30	185	10.20 (8.83–11.78)

ASV: adaptive servo ventilation; CI: confidence interval.