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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