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Table 3 Association of the sustained pattern with clinical data

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

 

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*

  1. 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
  2. PM-AHI, CT90%, Lowest SpO2, ODI and Hypoxic burden were obtained from a pulse oximeter performed during night
  3. The data are presented as median [interquartile range]. *P < 0.05
  4. 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%