Table 1.

General characteristics of sperm donors.

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%

Data are expressed as mean ± standard deviation (n = number of sperm donor candidates).