Health Consultation Assessment of Drinking Water Quality And Cancer Incidence Scituate, ma


B. Results of Cancer Incidence Analysis



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B. Results of Cancer Incidence Analysis
Tables 4 through 7 summarize cancer incidence data town-wide in Scituate and for each census tract for the time period 1987 to 1997. Figure 1 illustrates the location and boundaries of the three census tracts in Scituate. The following sections present results for Scituate as a whole and for each census tract.

1. Cancer Incidence in Scituate as a Whole (Table 4)

During the time period 1987-1997, breast cancer among females occurred above the expected rate (164 cases observed versus approximately 124 cases expected; SIR = 132). This elevation was statistically significant (95% CI = 112-154). No breast cancer cases were observed among males in Scituate. Kidney cancer also occurred more often than expected, although not significantly, overall and among both males and females when evaluated separately. Testicular cancer among males occurred slightly more often than expected town- wide. Five cases were observed among males and approximately four cases were expected

(SIR=117). Liver cancer occurred less often than expected in Scituate during the years evaluated (two cases observed versus approximately four cases expected).

Overall, leukemia occurred more often than expected. Among both males and females combined, 17 cases were observed and approximately 14 cases were expected (SIR=122).



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This elevation, based on an increase of approximately three cases, was not statistically significant. Among males, leukemia occurred less often than expected (five cases were observed and approximately eight cases were expected). Among females leukemia occurred more often than expected. Twelve cases were observed among females when approximately six cases were expected (SIR=196). This elevation was borderline statistically significant

(95% CI=101-342). These data are summarized in Table 4.




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