Table 2 Comparisons of semen conventional parameters between FA occupational exposure groups and reference group.

From: Associations between occupation exposure to Formaldehyde and semen quality, a primary study

Characteristics Reference group (n = 76) Low FA-exposed group(n = 57) High FA-exposed group(n = 57) P-valuea
Semen volume (ml) 2.5(2.0–3.6) 2.7(1.6–3.8) 2.3(2.0–3.5) 0.451
Sperm concentration (106/ml) 52.2(35.0–76.9) 52.1(31.6–76.8) 54.9(34.7–69.3) 0.880
Total sperm count (106) 134.3(83.1–215.7) 121.6 (76.6–211.9) 126.3(71.8–184.3) 0.648
Sperm progressive motility (PR,%) 49.9(35.3–63.1) 38.6(28.5–46.6) 36.0(25.5–45.6) <0.001*
Total motility (PR + NP,%) 59.5(46.0–72.4) 49.8(36.7–60.4) 43.8(32.7–53.1) <0.001*
  1. Note: Data are expressed as median values (interquartile ranges 25th–75th percentile shown in parentheses).
  2. PR: sperm progressive motility equals the spermatozoa moving actively, either linearly or in a large circle, regardless of speed.
  3. NP: non-progressive motility equals all the other patterns of motility with an absence of progression.
  4. aKruskal–Wallis analysis of variance was used to compare the median between groups *P < 0.05.