title: [Influence factors on the cryosurvival rate of post-thaw spermatozoa from sperm donors].
abstract: OBJECTIVE
  To investigate the influence of seasons, blood types and semen parameters on the cryosurvival rate of frozen-thawed spermatozoa from sperm donors.
  
  
  METHODS
  We retrospectively analyzed the influence of seasons, blood types, abstinence period, semen volume, sperm morphology, and pre-freeze sperm motility and concentration on the cryosurvival rate of frozen-thawed sperm in 4 088 semen samples from Shaanxi Human Sperm Bank.
  
  
  RESULTS
  The cryosurvival rate of the post-thaw sperm was correlated negatively with the progressive motility of the pre-freeze sperm (r = -0.262, P < 0.01), but positively with pre-freeze sperm concentration (r = 0.247, P < 0.01), and it was significantly higher in the 6-day abstinence group ([70.2 +/- 5.4]%) than in the other abstinence groups (P < 0.01), so was it in the normal sperm morphology rate > 20% group ([71.4 +/- 5.1]%) than in the others (P < 0.01). The survival rate of the post-thaw sperm was not correlated with seasons, blood types, and semen volume (P > 0.05).
  
  
  CONCLUSIONS
  Sperm motility, concentration and morphology and the abstinence period of sperm donors may be valuable predictors of the cryosurvival rate of post-thaw sperm, but no correlation was found between the survival rate and seasons, blood types and semen volume.
authors.forename: Liang
authors.initials: L
authors.lastname: Zhou
authors.forename: Zhou
authors.initials: Z
authors.lastname: Zhang
authors.forename: Juan-Zi
authors.initials: JZ
authors.lastname: Shi
authors.forename: Xiao-Hua
authors.initials: XH
authors.lastname: Liu
authors.forename: Wen-Hao
authors.initials: WH
authors.lastname: Shi
authors.forename: Hui
authors.initials: H
authors.lastname: Kou
authors.forename: Juan
authors.initials: J
authors.lastname: Song
mesh_terms: D000328:Adult; D015925:Cryopreservation; D006801:Humans; D008297:Male; D012189:Retrospective Studies; D012662:Semen Preservation; D013081:Sperm Motility; D013094:Spermatozoa; D055815:Young Adult