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Table 2 Comparison between the quality of the sweat test based on the concentrations of sweat chloride and sweat sodium (proposed criteria) and age of subjects examined, as well as the results of the sweat test in view of the sweat chloride concentration obtained in the exam. All subjects had cystic fibrosis and two CFTR mutations Class I, II and/or III

From: Quality of sweat test (ST) based on the proportion of sweat sodium (Na) and sweat chloride (Cl) as diagnostic parameter of cystic fibrosis: are we on the right way?

Variable Group Number Mean ± SD Median Minimum Maximum p-value
Sweat chloride/sodium ratio Correct 155 1.33 ± 0.24 1.27 1 2.11 <0.001
Incorrect 4 0.94 ± 0.03 0.93 0.9 0.97
Sweat chloride values Correct 155 112.48 ± 19.70 111.61 63.70 159.20 0.047
Incorrect 4 93.34 ± 13.52 94.18 79.61 105.40
Subject’s age Correct 133 3.47 ± 5.53 1 0 37.33 0.001
Incorrect 2 24.13 ± 8.66 24.12 18 30.25
  1. N number of patients, SD standard deviation, CFTR Cystic fibrosis transmembrane regulator. The statistical analysis was performed by the Mann-Whitney test. Alpha = 0.05