Skip to main content

Table 1 Patients’ characteristics

From: Characteristics of the nocturnal desaturation waveform pattern of SpO2 in COPD patients: an observational study

  All
N = 153
Desaturation + N = 128 Desaturation-N = 25 P value
Male/female 136/17 116/12 20/5 0.158
Age, years 72 [68–76] 71 [68–75] 73 [70.5–77.5] 0.063
BMI 22.7 [20.6–24.4] 22.7 [20.6–24.5] 22.6 [20.3–24.2] 0.542
Daytime SpO2, % 97 [96–98] 97 [96–98] 98 [96.3–98] 0.111
Smoking history,
pack-years
50 [40–75] 50 [40–76.5] 45 [33.1–60] 0.115
Severity
(Gold grade 1, 2, 3, 4)
27, 80, 38, 4
unknown 4
23, 68, 30, 3
unknown 4
4, 12, 8, 1 0.649
%FVC, % 89.7 [78.7–99.5] 90.1 [77.8–100.1] 85.8 [80.7–99.1] 0.932
%FEV1, % 59.8 [49.2–66.0] 62.4 [49.4–76.9] 63.3 [43.8–76] 0.576
FEV1/FVC, % 62.4 [47.9–76.7] 60.2 [50–66.1] 53.4 [40.5–63.3] 0.080
PM-AHI 15.2 [8.4–25.0] 17.2 [10.4–28.5] 6.6 [3.9–9.1]  < 0.0001*
CT90, % 1.48 [0.10–7.92] 2.7 [0.44–9.8] 0.03 [0–0.11]  < 0.0001*
Lowest SpO2, % 85 [79–89] 84 [78–87] 90 [88–91]  < 0.0001*
  1. The data are presented as median [interquartile range]. *P < 0.05
  2. PM-AHI, CT90% and Lowest SpO2 were obtained from a pulse oximeter performed during night
  3. 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%