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Table 3 Intensities of the peaks per day of sample preparation, category of sample storage duration and age group in healthy controls

From: Validation of previously identified serum biomarkers for breast cancer with SELDI-TOF MS: a case control study

   M/z4276 M/z4292 M/z8129 M/z8941
  n Median intensity (IQR) Median intensity (IQR) Median intensity (IQR) Median intensity (IQR)
Day of sample preparation      
   Day 1 24 74.04
(47.56–103.27)
62.78
(45.17–79.91)
27.39
(22.79–29.62)
78.94
(45.96–84.49)
   Day 2 24 24.83
(9.58–38.24)
34.61
(28.54–39.32)
22.65
(18.02–26.89)
72.85
(50.43–105.05)
p-value* 48 <0.001 0.001 0.008 0.853
Sample storage
duration (months)
     
   ≤ 11 13 75.81
(33.59–118.06)
63.48
(37.10–79.58)
27.54
(21.94–31.63)
57.48
(43.11–79.66)
   12–17 11 72.28
(50.60–87.56)
62.11
(46.25–83.88)
27.24
(24.70–29.87)
81.30
(52.43–99.14)
   18–31 12 32.33
(12.37–40.50)
33.99
(25.21–45.65)
23.66
(15.58–27.08)
62.97
(42.67–111.06)
   ≥ 32 12 16.43
(8.38–35.85)
34.77
(29.84–37.99)
22.18
(20.46–26.89)
73.47
(52.76–105.05)
p-value# 48 0.001 0.011 0.063 0.620
p-trend 48 <0.001 0.003 0.032 0.423
Age (yrs)      
   < 49.3 16 45.26
(19.00–77.58)
46.38
(31.02–62.95)
25.15
(21.29–27.55)
73.84
(49.50–84.49)
   49.3–57.5 16 19.79
(8.38–62.11)
35.78
(28.52–63.14)
24.90
(21.98–27.62)
69.16
(39.17–85.8)
   > 57.5 16 45.90
(23.58–85.81)
40.01
(30.47–72.05)
27.12
(20.43–33.59)
76.15
(56.15–101.64)
p-value# 48 0.346 0.680 0.753 0.850
p-trend 48 0.583 0.940 0.438 0.880
  1. M/z = Mass to Charge ratio, IQR = Inter-Quartile Range, * Mann-Whitney U Test, # Kruskal Wallis Test, Jonckheere-Terpstra Test