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Table 2 Characteristics of infertile men’ semen parameters between 2011 and 2017

From: Semen quality pattern and age threshold: a retrospective cross-sectional study of 71,623 infertile men in China, between 2011 and 2017

YearnSemen parameters [median (25–75)]
Semen volume(ml)Sperm concentration(106/ml)Sperm totalcount (106)Sperm progressive motility (PR)Total motile spermatozoa[(PR + NP)]Immotile spermatozoa (IM)Total motile sperm count (106)
201162363.2(2.4–4.1)47.1(20.3–70.9)143.8(70.1–214.0)35.5(24.0–46.0)46.5(38.5–61.9)53.5(37.8–61.2)73.8(34.2–117.5)
201285293.0(2.4–4.2)51.6(21.0–82.5)145.3(71.8–178.8)33.4(25.1–36.9)49.8(32.3–62.6)50.2(36.8–68.3)68.9(30.4–110.1)
201310,2053.2(2.3–4.3)41.2(18.2–61.3)126.5(63.0–166.3)35.2(28.3–37.6)46.9(41.1–56.8)53.0(46.1–70.3)57.6(28.9–108.3)
201411,8093.0(2.2–4.0)52.1(26.6–85.1)153.1(72.9–130.7)35.1(22.1–47.2)50.3(38.2–61.6)49.7(38.3–61.8)75.6(29.9–130.7)
201512,3313.2(2.4–4.2)40.1(23.5–52.3)117.8(65.0–178.9)37.8(28.4–44.9)46.8(40.2–54.8)53.2(45.2–59.4)55.5(26.1–91.9)
201611,0753.2(2.4–4.2)48.3(28.4–70.2)145.4(78.5–223.3)38.1(26.1–46.6)55.1(42.5–62.5)44.8(37.3–57.4)75.4(36.2–123.7)
201711,4383.3(2.5–4.4)43.6(31.2–59.6)140.6(82.5–204.9)36.1(25.5–43.9)46.7(36.7–56.1)53.2(43.8–63.1)64.9(32.5–105.4)
P-valuea <  0.001<  0.001<  0.001<  0.001<  0.001<  0.001<  0.001
P-valueb > 0.1> 0.1> 0.1> 0.1> 0.1> 0.1> 0.1
Sen’s slope estimatecQ0.017−0.583−0.5330.5200.075−0.075− 0.800
B3.1347.10143.8034.1646.7553.1569.70
  1. aThe Kruskal-Wallis test was used to compare the median value between groups
  2. bThe Mann-Kendall test was used to assess trends in semen parameters from 2011 to 2017
  3. cSen’s slope estimate:equation = Q*(year-firstYear) + B for a linear trend