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Table 2 Comparison of covariates between the subgroup with false-negative ultrasound examination and the remaining population

From: Most patient conditions do not a priori debilitate the sensitivity of thoracic ultrasound in thoracic surgery-a prospective comparative study

Covariate False negatives (n = 59) Rest population (n = 274) p-value
Proportion / mean ± standard deviation Proportion / mean ± standard deviation
Age, years 65.7 ± 12.7 64.1 ± 11.0 0.38 t
COPD GOLD grade mode: 2 mode: 0 0.22 c
Chest tube 0.32 0.42 1 c
Soft tissue emphysema 0.12 0.14 1 c
Ipsilateral pretreatment (surgery or irradiation) 0.10 0.23 1 c
Packyears 33.8 ± 27.35 32.1 ± 26.9 0.66 t
Thoracotomy 0.42 0.52 1 c
BMI, kg/m2 25.6 ± 4.6 26.9 ± 5.5 0.08 t
Male gender 0.54 0.55 1 c
Supine X-ray 0.68 0.57 1 c
  1. c Chi-squared-test, t student‘s t-test