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

Table 1 Baseline characteristics

Variable	Analogue 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

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 *

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