Table 2 Univariate and multivariate analysis

Sex

(male vs female)

p = 0.05

HR 0.24

(0.057 – 1.041)

P = 0.032

HR 0.176

(0.036 – 0.865)

COPD

(no vs yes)

p = 0.03

HR 0.20

(0.048 – 0.896)

P = 0.021

HR 0.15

(0.03 – 0.756)

Uni x Bilateral

p = 0.26

HR 0.44

(0.105 – 1.873)

Age

(<45 y vs ≥45 y)

p = 0.77

HR 1.21

(0.325 – 4.533)

ZPS pretreatment

(0–2 vs 3/4)

p = 0.09

HR 0.30

(0.72 – 1.243)

ZPS posttreatment

(0–1 vs 2–4)

p = 0.07

HR 0.27

(0.63 – 1.164)

Sex

(male vs female)

p = 0.42

HR 0.44

(0.06 – 3.24)

COPD

(no vs yes)

p = 0.94

HR 1.079

(0.111 – 10.519)

Uni x Bilateral

p = 0.15

HR 0.239

(0.033 – 1.718)

Age

(<45 y vs ≥45 y)

p = 0.29

HR 73.655

(0.023 - >100)

ZPS pretreatment

(0–2 vs 3/4)

p = 0.06

HR 0.114

(0.012 – 1.117)

ZPS posttreatment

(0–1 vs 2–4)

p = 0.33

HR 0.006

(<0.001 - >100)