Table 1.

Comparison of thickness distributions among cohorts

			Thickness (mm)
			0.01–0.25		0.26–0.50		0.51–0.75		0.76–1.00
Cohort	Period	N	%	95% CI	%	95% CI	%	95% CI	%	95% CI
SEER	2004–2010	51,855	21.0	(20.7–21.4)	42.3	(41.9–42.7)	22.4	(22.4–22.1)	14.2	(13.9–14.5)
SEER	1988–2003	42,851	18.8	(18.4–19.1)	40.8	(40.4–41.3)	24.7	(24.7–24.3)	15.7	(15.4–61.1)
Sweden	1990–2008	13,026	5.8	(5.4–6.2)	39.0	(38.2–39.8)	27.4	(27.3–26.6)	27.9	(27.1–28.6)
Queensland	1982–2006	26,736	8.9	(8.5–9.2)	43.2	(42.6–43.8)	31.3	(31.3–30.7)	16.6	(16.2–17.1)
Germany	1976–2000	12,728	8.4	(7.9–8.9)	36.3	(35.5–37.1)	29.7	(29.6–28.9)	25.6	(24.9–26.4)
PLG	1996–2006	1,315	15.0	(13.1–16.9)	41.4	(38.8–44.1)	26.1	(26.1–23.7)	17.5	(15.4–19.5)
PLG	1982–1995	1,056	10.1	(8.5–11.7)	37.6	(35.1–40.1)	29.1	(29.1–26.8)	23.2	(21.0–25.4)

Abbreviations: CI, Confidence Interval; SEER, Surveillance, Epidemiology and End Results; PLG, Pigmented Lesion Group.