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Table 3 Comparison of compounds showing coefficient of variation lower than 30 % and Freeze-dry

From: Freeze-drying: an alternative method for the analysis of volatile organic compounds in the headspace of urine samples using solid phase micro-extraction coupled to gas chromatography - mass spectrometry

 

Prop.test

 

Prop.test

Comparison

p value

Comparison

p value

Freeze vs Fresh

0.768

HCl vs NaOH

0.489

Freeze vs Frozen

0.016

NaOH vs Fresh

0.068

Freeze vs NaCl

<0.001

NaOH vs Frozen

0.632

Freeze vs NaOH

0.014

NaOH vs NaCl

0.056

Freeze vs HCl

0.052

NaCl vs Fresh

0.002

HCl vs Fresh

0.148

NaCl vs Frozen

0.345

HCl vs Frozen

0.272

Frozen vs Fresh

0.043

HCl vs NaCl

0.007