Table 3.

Percentage of articles with only male, only female, and both male and female subjects

Human subjects	Decade
	1950s	1960s	1970s	1980s	1990s	2000s	2010s	Total
Only males	75	45	31.4	20.5	13.3	4.2	16.7	21.3
Only females	0	20	7.8	9	7.8	5.6	0	8.7
Males/females	25	35	60.8	70.5	78.9	90.2	83.3	70
Nonhuman subjects
Only males	85.7	74.2	82.9	74.1	80.3	71.4	60.9	75.2
Only females	14.3	18.2	14.6	18.5	11.5	14.3	21.7	15.8
Males/females	0	7.6	2.5	7.4	8.2	14.3	17.4	9