Table 4.

Between countries comparison of male first authors, UK, USA, 1980, 1990, 2000, 2009 (Australia not included because of small numbers)

		Year
Country	1980	1990	2000	2009	P value for overall association	P value for trend	P value for 1990, 2000, 2009	P value for trend (1990, 2000, 2009)
UK	35	93	127	200	0.081	0.027	<0.001	<0.001
US	14	15	18	14
Australia		2	5	6			0.6*

*Fisher's exact test