Abbreviations: SMR, standardized mortality ratio; CI, confidence intervals.
a International Classification of Diseases, Eighth Revision codes (ICD-8): 950-959; International Classification of Diseases, Ninth Revision codes (ICD-9): 950-959; and International Statistical Classification of Diseases and Related Health Problems, Tenth Revision (ICD-10) codes U03, X60-X84, and Y87.0 and recode 50220.
b ICD-8: 800-949; ICD-9: 800-949; and ICD-10: V01-X59 and Y85-Y86 and recode 50210.
c Per 100,000 person-years.
d In brief, SMRs were estimated as the ratios of observed to expected number of deaths. The observed number of deaths represents the total number of deaths from suicide or accidental injury among patients with primary ovary cancer. To obtain the expected number of deaths, we derived the stratum-specific mortality rates of suicide or accidental injury of the general US population and calculated the person-years of relevant strata in the cancer group. The stratum-specific expected number of deaths was estimated as the product of mortality rate in the cancer-free control and the person-years in the cancer group. The total expected number of deaths was a summation of all the expected number of deaths across the strata.
e Income (median family income) and educational level (percentage of residents >25 years of age with at least a bachelor’s degree) were categorized into quartiles.
f The variable of low grade included “Well differentiated; Grade I” and “Moderately differentiated; Grade II”, and the variable of high grade included “Poorly differentiated; Grade III” and “Undifferentiated; anaplastic; Grade IV”.
Table 2. The risk of suicide and accidental death among patients with ovarian cancer by histological subgroup.