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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