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Table 1 Socio-demographic data of male volunteers

From: Obesity-related DNA methylation at imprinted genes in human sperm: Results from the TIEGER study

TIEGER participants Normal weight n = 46 Overweight or obese n = 23
n % n %
Age 18–24 years 25 54.3 3 13.0
25–29 years 12 26.1 7 30.4
30–35 years 9 19.6 13 56.5
p value 0.001
Highest degree of education High school 6 13.3 1 4.3
Some college or college degree 27 60.0 15 65.2
Graduate 12 26.7 7 30.4
p value 0.59
Marital status Single 31 68.9 5 21.7
Married/living with partner 14 31.1 17 73.9
Divorced/widow 0 0 1 4.3
p value 0.0003
Having childrena No 41 89.1 19 82.6
Yes 5 10.9 4 17.4
p value 0.47
Watching TV (inactive/seated) Less than 4 h per week 17 37.0 4 17.4
4 h or more per week 29 63.0 19 82.6
p value 0.16
Exercise (heavy/sweating) Less than 2 h per week 16 34.8 11 47.8
2 h or more per week 30 65.2 12 52.2
p value 0.29
Sperm concentration <1.5 × 107 3 7.0 1 4.3
≥1.5 × 107 40 93.0 22 95.7
p value 0.67
Sperm total motility count ≤3.9 × 107 8 18.6 4 17.4
>3.9 × 107 35 81.4 19 82.6
p value 0.90
Sperm motility <40 % 6 14.0 7 30.4
≥40 % 37 86.0 16 69.6
p value 0.11
Patient at Fertility clinic No 40 87.0 9 39.1
Yes 6 13.0 14 60.9
p value <0.001
  1. If the sum was not 46 (normal BMI) or 23 (overweight/obese), respectively, data were missing and percentage was calculated on known data. Chi-square test was applied, except if n ≤ 5, in this case Fisher exact test is used
  2. aHaving children: only one was conceived through ART; this was in the category of men with normal weight