Suppose the expected number of breast cancer cases among a large number of 45- to 49-year-old women in this study who were followed for 7 years is 149, while the observed number of cases is 107. Is there an unusually small number of cases among Asian women? Why or why not? Another aspect of the study is to use the SWHS data to predict the long-term incidence of breast cancer in Chinese women. Those incidence data are presented in Table.
Table : Incidence rate of breast cancer by age in the SWHS
Age Annual incidence per 105 women
|
40-44
|
63.8
|
|
45-49
|
86.6
|
|
50-54
|
92.6
|
|
55-59
|
107.0
|
|
60-64
|
120.9
|