Table 1– Numbers of males and females and age ranges in the four datasets

	Male		Female
	Subjects	Age years	Subjects	Age years
Australia 1	1418	6.3–93.6	1401	6.5–94.6
Australia 2	1980	8.2–92.4	2304	9.1–94.6
Poland	5662	18.0–91.0	5183	18.0–92.0
USA	2594	3.8–65.0	2225	3.7–77.1

Data are presented as n or range.