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Table 2 Characteristics of the serum samples

From: Searching for early breast cancer biomarkers by serum protein profiling of pre-diagnostic serum; a nested case-control study

  Cases
(n = 68)
Controls
(n = 68)
P-value
Serum sample storage duration* (years)    
   Mean (SD) 11.2 (1.1) 11.2 (1.1) 0.900§
Hours in refrigerator    
   Median (IQR) 22 (21-23) 22 (20-23) 0.845#
Days at -86°C    
   Median (IQR) 8 (6-11) 7 (5-11) 0.429#
  1. SD: standard deviation; IQR: inter-quartile range; * Until date of experiment; Between collection and centrifugation; Between centrifugation and storage at liquid nitrogen; § Independent samples T test; # Mann-Whitney U test.