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. 2018 Oct 17;13:3389–3398. doi: 10.2147/COPD.S174665

Table 2.

Comparison between the baseline characteristics according to survival status (survivors vs non-survivors) after 9 years

Variable Total (N=110) Survivors (n=46) Non-survivors (n=64) P-value

Male/female sex, n 75/35 28/18 47/17 0.235a
Age, years 65 (9.4) 61.5 (8.7) 67.6 (9) <0.001b
SB, pack-years 50 (34.7–70) 43 (30–75) 50 (40–69) 0.616c
SpO2, % 93 (92–96) 94 (92.7–96) 93 (91–95) 0.035c
FEV1, % of the predicted 52.5 (39–73.2) 61 (46.5–79) 46 (37–64.7) 0.004c
FEV1, L 1.21 (0.94–1.71) 1.47 (0.99–1.92) 1.10 (0.86–1.48) 0.020c
BMI, kg/m2 25 (21–28) 25.4 (22.3–28.6) 24.5 (20.6–28) 0.142c
Fat-free mass, kg 41.6 (7.3–0.7) 41 (7) 42 (7.5) 0.556b
mMRC, score 1 (1–2) 1 (1–2) 2 (1–2) 0.076c
6MWT, m 429 (94.2) 461 (90.4) 406 (90.6) 0.002b
BODE, class 1 (1–2) 1 (1–1.2) 2 (1–3) <0.001c

Notes: Parametric data are expressed as mean and SD and nonparametric as median (IQR 25–75).

a

Chi-squared test,

b

unpaired t-test, or

c

Mann–Whitney. BODE index: class 1 (score 0–2), class 2 (score 3 and 4), class 3 (score 5 and 6), and class 4 (score 7–10).

Abbreviations: 6MWT, 6-minute walk test; BMI, body mass index; BODE, Body mass index, airway Obstruction, Dyspnea, and Exercise capacity; SB, smoking burden; SpO2, pulse oximetry; mMRC, Modified Medical Research Council.