Overall Incidence: 1979-1996
During the years 1979 through 1989 the number of newly diagnosed prostate cancers per year among New Jersey men rose gradually from 2,574 in 1979 to 3,662 in 1989 and then rose rapidly to 7,954 in 1992, after which the number of new cases then declined. The increasing numbers reflected both an increase in the rate at which prostate cancer occurred in men and an increase in the number of men in the older age groups in the population.
Prostate cancer accounted for about 30 percent of the total cancers (excluding skin) diagnosed among New Jersey men. The annual age-adjusted incidence rate rose from 75.9 to 194.2 per 100,000 men between 1979 and 1992, and then declined. (See Figures 1 and 2 and Appendix II Table 4) Preliminary data for 1997 indicate that over 6,600 cases were diagnosed during that year, for a rate of 154.9 prostate cancers per 100,000 men.
*Age-adjusted to the U.S. 1970 standard population
As indicated in Figure 3, eighty-six percent of the reported cases of prostate cancer occurred among white men and 11 percent were among black men. Throughout these years, the age-adjusted incidence rates in black men were about 50 percent higher than the rates in white men. (see Figure 4) The incidence rate for white men began to decline in 1993. The incidence rate for black men began to decrease in 1994 (also see Appendix II, Table 5). Preliminary 1997 data indicate that the rate increased to about 145 for white men and 225 for black men.
*Age-adjusted to U.S. 1970 population
Age-Specific Incidence Rates By Year: 1979-1996
Among the oldest age group (age 85 and over) the incidence rate is about 1,000 times the incidence rate in men younger than 45 (see Figure 5 and Appendix II, Table 6). For men below 45, incidence rates have been stable since 1979. For those 65 and above, the incidence rates peaked in 1992 and then declined. The peak in incidence rates in 1992 in the older men may reflect the use of PSA screening, particularly in these age groups. In 1995, the incidence rate for the oldest age group (85+) dipped below the incidence rates of the 65-74 and the 75-84 age groups, possibly reflecting a decrease in the practice of screening men over age of 85.
Age-Specific Incidence Rates by Race: 1979-1996
The incidence rates increased with each 10-year age group for both white and black men. There were no differences between the rates for black and white men below age 45. After age 45, differences between black and white men increased with each successive stage decade of age to the age group 75-84. (see Figure 6 and Appendix II, Table 6)
Age-Adjusted Incidence Rates by County: 1979-1996
The age-adjusted incidence rates among the twenty-one counties of New Jersey are shown in Table 1. It can be seen that there is considerable variation among the counties. Some of the differences among county rates may reflect differences in screening, as reflected in Table 2 in the next section, which shows the distributions of stage at diagnosis among counties. Some of the differences in county rates are also due to random fluctuations.
Prostate Cancer Incidence And Incidence Rates
By County And Race, New Jersey - 1979-1996*
*Incidence rates per 100,000 men, age-adjusted to the 1970 U.S. standard population. Incidence rates were not calculated for numbers fewer than 20.
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