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Table 6 Statistical results related to the concentration of isoprene in exhaled breath (PTR-MS), whose concentrations show gender- and age-specific behavior [33].

From: Noninvasive detection of lung cancer by analysis of exhaled breath

compared populations

restricted to population

p-value*)

H0: equal mean values for log-transformed concentrations;

H1: not equal mean values

median

concentration of

isoprene for

population (A)

median

concentration of isoprene for

population (B)

Female (population A)

vs.

Male (population B)

Control, younger 50 years

0.0005

103.9 ppb

133.7 ppb

 

Control, older 50 years

0.940, not significant

98.1 ppb

100.0 ppb

 

CA-patients

0.0008

72.9 ppb

87.1 ppb

Control, younger 50 years (A) vs.

control, older 50 years (B)

Female

0.564, not significant

103.9 ppb

98.1 ppb

 

Male

0.0002

133.7 ppb

100.0 ppb

CA-patients (A) vs.

control, older 50 years (B)

Female

1.0*10-5

72.9 ppb

98.1 ppb

 

Male

0.022, not significant

87.1 ppb

100.0 ppb

  1. *) according Kruskal-Wallis test, alpha-level = 0.01