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Table 3.

Characteristics of studies on mammographic features in relation to breast cancer risk conducted in symptomatic populations

First author, y (ref.)Study design. Study population characteristics. Matching variables if applicable (Match). Variables adjusted for in analysis (Adj)No. cases: noncasesAge (y)Mammographic feature
Studies using prospective (prediagnostic) mammograms     
Wolfe, 1976 (62) Cohort: mammography attendees at Hutzel hospital, United States; cases diagnosed 0.5-3.5 y after negative mammogram.  30-60+ Wolfe 
    Study 1 1967-1974 20:1,910   
    Study 2 1972-1975. Adj: none. 56:5,228   
Egan, 1979 (60) Cohort: referrals to Emory University Clinic, United States, 1963-1977; cases diagnosed at least 0.5 y after negative mammogram. Adj: A. 131:6,334 35-70+ Wolfe 
Studies using concurrent (diagnostic) mammograms     
Peyster, 1977 (63) CC. Cases and controls: referrals to Massachusetts General Hospital, United States, 1972-1976. Adj: A. 402:1,036 30-60+ Wolfe 
Brebner, 1978 (65) XS. Referrals for mammography at Johannesburg General Hospital, South Africa. Adj: A. 300:2,702 <20-60+ Wolfe 
Egan, 1979 (60) XS. As for Egan 1979, but cases diagnosis and timing of breast density measurement are concurrent. Adj: A. 658:13,465 30-70+ Wolfe 
Boyd, 1982 (64) CC. Cases: Women's College Hospital, Canada, 1973-1979; controls: diagnostic referral service. Match: A, YR. 183:183 40-65 Wolfe 
Tabar, 1982 (49) CC. Cases: Kopparberg County screening program, Sweden; controls: referred for mammography. Adj: A. 183:1,674 40-75+ Wolfe 
Kojima, 1984 (61) XS. Women who underwent xeromammography at Kyoto Prefectual University of Medicine, Japan, 1978-1982. Majority had clinical breast disease. Adj: A. 91:746 30-60+ Wolfe 
Wolfe, 1987 (31) MCC. Cases: Hutzel hospital, United States, 1979-1982; controls: screened at the same hospital, generally symptomatic. Match: YR, A, R, AFB, FH. Adj: no other. 160:160 30-85 Wolfe, PD 
First author, y (ref.)Study design. Study population characteristics. Matching variables if applicable (Match). Variables adjusted for in analysis (Adj)No. cases: noncasesAge (y)Mammographic feature
Studies using prospective (prediagnostic) mammograms     
Wolfe, 1976 (62) Cohort: mammography attendees at Hutzel hospital, United States; cases diagnosed 0.5-3.5 y after negative mammogram.  30-60+ Wolfe 
    Study 1 1967-1974 20:1,910   
    Study 2 1972-1975. Adj: none. 56:5,228   
Egan, 1979 (60) Cohort: referrals to Emory University Clinic, United States, 1963-1977; cases diagnosed at least 0.5 y after negative mammogram. Adj: A. 131:6,334 35-70+ Wolfe 
Studies using concurrent (diagnostic) mammograms     
Peyster, 1977 (63) CC. Cases and controls: referrals to Massachusetts General Hospital, United States, 1972-1976. Adj: A. 402:1,036 30-60+ Wolfe 
Brebner, 1978 (65) XS. Referrals for mammography at Johannesburg General Hospital, South Africa. Adj: A. 300:2,702 <20-60+ Wolfe 
Egan, 1979 (60) XS. As for Egan 1979, but cases diagnosis and timing of breast density measurement are concurrent. Adj: A. 658:13,465 30-70+ Wolfe 
Boyd, 1982 (64) CC. Cases: Women's College Hospital, Canada, 1973-1979; controls: diagnostic referral service. Match: A, YR. 183:183 40-65 Wolfe 
Tabar, 1982 (49) CC. Cases: Kopparberg County screening program, Sweden; controls: referred for mammography. Adj: A. 183:1,674 40-75+ Wolfe 
Kojima, 1984 (61) XS. Women who underwent xeromammography at Kyoto Prefectual University of Medicine, Japan, 1978-1982. Majority had clinical breast disease. Adj: A. 91:746 30-60+ Wolfe 
Wolfe, 1987 (31) MCC. Cases: Hutzel hospital, United States, 1979-1982; controls: screened at the same hospital, generally symptomatic. Match: YR, A, R, AFB, FH. Adj: no other. 160:160 30-85 Wolfe, PD 

Abbreviations: CC, case-control; A, age; AFB, age at first birth; FH, family history of breast cancer; R, race/ethnicity; WT, weight; YR, year; MCC, matched case-control; XS, cross-sectional study.

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