Table 1.

Leukaemia incidence by age among males in the Town of Union, Broome County, NY: 1981–90.

Age Group	Number of cases		SIR	95% C. I.a
	Observed	Expectedb		Lower CI	Upper CI
0–44	6	7.5	0.80	0.29	1.75
45–64	7	10.0	0.70	0.28	1.44
65–74	21	10.1	2.09	1.29	3.19
75+	20	12.7	1.57	0.96	2.42
Total	54	40.4	1.34	1.01	1.75

^a Exact 95% confidence intervals calculated for the Poisson distribution³⁰.

^b Expected numbers based on the NYSDOH Bureau of Cancer Epidemiology Cancer Incidence Standard: 1983–1987, which includes age and sex specific cancer rates for population density Quintile III (suburban). Population of the study area based on 1986 estimated population of the Town of Union based on linear interpolation between 1980 and 1990 Census population estimates.