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.
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