Table 2.
Descriptive characteristics of participants’ semen parameters between 2009 and 2019.
| Year | n | Sperm concentration (million/mL) | Total sperm count (million) | Progressive motility (%) | Total motility (%) |
|---|---|---|---|---|---|
| Median [IQR 25–75] | Median [IQR 25–75] | Median [IQR 25–75] | Median [IQR 25–75] | ||
| 2009 | 907 | 62.0 [40.0–77.0] | 160.0 [100.0–225.0] | 54.0 [40.0–64.0] | 60.0 [48.0–69.0] |
| 2010 | 408 | 60.0 [40.0–74.0] | 157.0 [104.5–219.0] | 60.0 [45.25–65.0] | 65.0 [50.0–70.0] |
| 2011 | 981 | 56.0 [39.0–73.0] | 150.0 [80.0–210.0] | 50.0 [40.0–65.0] | 60.0 [45.0–70.0] |
| 2012 | 751 | 53.0 [30.0–72.0] | 138.0 [80.0–195.0] | 50.0 [40.0–65.0] | 60.0 [45.0–70.0] |
| 2013 | 3,258 | 51.0 [31.0–68.0] | 126.0 [75.0–200.0] | 50.0 [35.0–65.0] | 60.0 [45.0–70.0] |
| 2014 | 5,446 | 50.0 [30.0–65.0] | 120.0 [70.00–190.0] | 50.0 [40.0–60.0] | 60.0 [45.0–70.0] |
| 2015 | 3,759 | 47.0 [27.0–62.0] | 118.0 [63.0–183.0] | 50.0 [40.0–62.0] | 60.0 [45.0–70.0] |
| 2016 | 2,523 | 45.0 [25.0–60.0] | 111.0 [61.0–171.1] | 49.0 [39.0–59.0] | 59.0 [49.0–69.0] |
| 2017 | 2,343 | 42.0 [22.0–57.0] | 100.0 [60.0–160.0] | 48.0 [38.0–58.0] | 57.0 [42.0–64.0] |
| 2018 | 1,412 | 34.0 [24.0–55.0] | 80.0 [50.0–166.0] | 41.0 [31.0–51.0] | 54.0 [40.0–60.0] |
| 2019 | 2,148 | 32.0 [12.00–54.0] | 80.0 [25.0–135.0] | 40.0 [21.0–43.0] | 46.0 [30.0–49.0] |
| Rates of decrease per year | 3.9 | 4.2 | 2.5 | 1.9 |
Rates of decrease per year were assessed using multiple regression analysis adjusting for age, BMI, and days of sexual abstinence.
IQR interquartile range.