Table 3.

Association of the sustained pattern with clinical data

	Desaturation with sustained pattern N = 20	Desaturation without sustained pattern N = 108	P value
Male/female	17/3	99/9	0.399
Age, years	71.5 [65.8–76]	71 [68–75]	0.870
BMI	23.4 [21.4–26.2]	22.6 [20.4–24.3]	0.288
Daytime SpO2, %	96 [95–97]	97 [96–98]	0.016*
Smoking history, pack-years	60 [50–81.5]	50 [40–75]	0.114
%FVC, %	96.4 [87.5–110.9]	89.7 [77.4–98.1]	0.031*
%FEV1, %	68.8 [16.3–79.7]	62.1 [50.3–76.5]	0.441
FEV1/FVC, %	58.2 [45.2–66.2]	60.6 [50.5–66.1]	0.419
PM-AHI	8.4 [4.3–18.2]	19.2 [12.1–28.7]	0.003*
CT90, %	16.4 [1.9–37.1]	2.1 [0.35–6.3]	0.002*
Lowest SpO2, %	85 [80–87.5]	84 [78–87]	0.935
ODI	7.8 [4.6–11.9]	4.4 [2.4–8.6]	0.046*
Hypoxic burden, (%min)/h	46.8 [26.3–91.9]	5.9 [2.4–17.1]	< 0.0001*

Desaturation with the sustained pattern consists of S, S + P, S + I and S + P + I. Desaturation without the sustained pattern consists of I, P and P + I. S: Sustained, P: Periodic, I: Intermittent

PM-AHI, CT90%, Lowest SpO₂, ODI and Hypoxic burden were obtained from a pulse oximeter performed during night

The data are presented as median [interquartile range]. *P < 0.05

BMI body mass index, FVC forced vital capacity, FEV₁ forced expiratory volume in 1 s, PM-AHI apnoea-hypopnea index from portable monitor, CT90 cumulative percentage time at SpO₂ below 90%