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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