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Table 1 Results of the descriptive statistics and test statistics

From: Half a pack of cigarettes a day more than doubles DNA breaks in circulating leukocytes

Descriptive statistics

Tail moment

Olive moment

Group

non-smokers

smokers

ALL

non-smokers

smokers

ALL

Mean

0·40

9·37

4·82

0·24

5·06

2·61

Median

0·00

0·44

0·00

0·00

0·54

0·03

StdDev

3·43

18·26

13·79

1.74

10.19

7.65

IQR

0·00

9·46

0·83

0·03

4·54

0·76

Min

0·00

0·00

0·00

0·00

0·00

0·00

Max

52·97

115·24

115·24

27·22

62·88

62·88

N

500

485

985

500

485

985

Test statistics

Tail moment

Olive moment

Differences of Means*

0.54

0.48

95% C.I.

0·39-0·68

0·32-0·64

P-value

< 0.001

< 0.001

  1. The descriptive statistics (based on calculation of raw data) of the tail moment and olive moment in smokers and non-smokers is shown in the upper section of the table. The results of the test statistical analysis in which fractions of non-zero values were compared to the total number of observations have been shown in the lower part of the table.
  2. IQR: Inter-quartile range
  3. * Fraction of nonzeros