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Table 1 Alterations in epigenetic indicators in smoking normozoospermic men

From: Effects of paternal exposure to cigarette smoke on sperm DNA methylation and long-term metabolic syndrome in offspring

Parameters N SN
Cigarette pack yearsa 0 15.00 ± 2.64
Age (years) 32.54 ± 0.60 34.13 ± 0.99
Sperm density (× 106 cells/mL) 99.23 ± 10.54 91.53 ± 10.91
Semen volume (mL) 2.77 ± 0.18 2.93 ± 0.27
Sperm vitality (%) 85.54 ± 1.99 86.04 ± 1.47
Sperm motility (%) 63.00 ± 2.38 57.96 ± 2.17
Semen ROS (U/L) 1515 ± 520 3807 ± 912*
Sperm histone-transition abnormality 9.98 ± 0.88 12.92 ± 1.03*
Methylation level of sperm DNA (%) 1.94 ± 0.16 2.44 ± 0.16*
  1. Data are presented as means  ±  SEM
  2. N normozoospermic men who did not smoke; SN normozoospermic men who smoke heavily. aCigarette pack years was calculated by multiplying smoking dose (packs per day) by duration (years of smoking)
  3. *p  < 0.05 compared to the N group