Table 1 General characteristics of sperm donors.
From: A longitudinal study of semen quality among Chinese sperm donor candidates during the past 11 years
Year | n | Age (years) | BMI (kg/m2) | Sexual abstinence (days) |
|---|---|---|---|---|
2009 | 907 | 22.85 ± 3.26 | 21.65 ± 2.36 | 4.58 ± 1.50 |
2010 | 408 | 22.99 ± 3.35 | 21.70 ± 2.36 | 4.52 ± 1.46 |
2011 | 981 | 25.05 ± 4.09 | 21.77 ± 2.41 | 4.59 ± 1.50 |
2012 | 751 | 25.51 ± 4.97 | 22.59 ± 2.49 | 4.74 ± 1.46 |
2013 | 3,258 | 26.47 ± 5.12 | 22.74 ± 2.51 | 4.78 ± 1.44 |
2014 | 5,446 | 27.30 ± 5.63 | 22.75 ± 2.77 | 4.78 ± 1.55 |
2015 | 3,759 | 27.14 ± 5.59 | 22.92 ± 2.86 | 4.79 ± 1.13 |
2016 | 2,523 | 27.66 ± 5.35 | 22.94 ± 3.01 | 4.85 ± 1.42 |
2017 | 2,343 | 27.81 ± 5.12 | 23.08 ± 2.78 | 5.02 ± 1.50 |
2018 | 1,412 | 28.13 ± 5.34 | 23.30 ± 2.90 | 4.86 ± 1.36 |
2019 | 2,148 | 27.88 ± 5.79 | 23.36 ± 2.94 | 5.15 ± 2.31 |
Rates of increase per year | 1.6% | 0.7% | 1.1% |
