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Table 1 Baseline characteristics

From: Digital versus analogue chest drainage system in patients with primary spontaneous pneumothorax: a randomized controlled trial

VariableAnalogue drainage
N = 50
Digital drainage
N = 52
P-value
Age (years)32 (range 18–86)33 (range 18–89)0.869
Male (n, %)40 (80%)46 (88%)0.284
Height (cm)180 (170–188)180 (177–186)0.386
BMI (kg/m2)20.9 (18.5–23.6)22.3 (20.0–24.2)0.035*
Left sided pneumothorax (n, %)21 (42%)21 (40%)0.868
Current/former smokers (n, %)38 (76%)45 (87%)0.208
First episode of pneumothorax (n, %)47 (94%)46 (88%)0.488
Secondary spontaneous pneumothorax (n, %)4 (8%)2 (4%)0.432
  1. Data presented as median (IQR) or number of patients (%) unless otherwise stated. BMI: body mass index. Statistical tests used: Mann Whitney test, Fisher’s exact test, Chi-square test. Statistical significance indicated with an *