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Table 2.

Selected characteristics among controls who were never/former oral contraceptive users and recent oral contraceptive users

Medical record review subseta
Combined OC usebCombined OC useb
Never/former use (n = 19,953)Recent use (n = 1,999)Never/former use (n = 579)Recent use (n = 103)
n (%)n (%)n (%)n (%)
Agec, y 
 19–29 132 (0.7) 65 (3.3) 13 (2.3) 5 (4.9) 
 30–34 839 (4.2) 302 (15.1) 49 (8.5) 20 (19.4) 
 35–39 2,518 (12.6) 426 (21.3) 140 (24.2) 33 (32.0) 
 40–44 6,185 (31.0) 549 (27.5) 377 (65.1) 45 (43.7) 
 45–50 10,279 (51.5) 657 (32.9) 0 (0.0) 0 (0.0) 
Race 
 White 11,519 (79.8) 1,209 (82.6) 311 (76.8) 53 (79.1) 
 Asian 1,490 (10.3) 121 (8.3) 51 (12.6) 7 (10.4) 
 Black 757 (5.2) 69 (4.7) 27 (6.7) 4 (6.0) 
 Other 674 (4.7) 65 (4.4) 16 (4.0) 3 (4.5) 
 Missing 5,513 535 174 36 
Ethnicity 
 Non-Hispanic 15,083 (95.1) 1,428 (94.4) 401 (95.0) 63 (92.6) 
 Hispanic 775 (4.9) 85 (5.6) 21 (5.0) 5 (7.4) 
 Missing 4,095 486 157 35 
Body mass index (kg/m2, available for reference dates from June 1998 and later)d 
 <25 2,771 (40.9) 425 (46.8) 148 (40.4) 40 (48.8) 
 25.0–29.9 1,862 (27.5) 235 (25.9) 100 (27.3) 22 (26.8) 
 30+ 2,140 (31.6) 249 (27.4) 118 (32.2) 20 (24.4) 
 Missing 2,869 385 38 
Recent screening mammogram (within 18 months before reference date, available for women ≥40 years of age with reference dates from June 1998 and later)e 
 No 5,580 (71.2) 507 (62.5) 186 (75.6) 27 (77.1) 
 Yes 2,256 (28.8) 304 (37.5) 60 (24.4) 8 (22.9) 
Parous 
 No — — 126 (24.7) 42 (42.4) 
 Yes — — 384 (75.3) 57 (57.6) 
 Missing   69 
First-degree family history of breast cancer (includes mother, sisters, and daughters) 
 No — — 416 (91.0) 81 (94.2) 
 Yes — — 41 (9.0) 5 (5.8) 
 Missing   122 17 
First-degree family history of ovarian cancer (includes mother, sisters, and daughters) 
 No — — 399 (98.0) 76 (96.2) 
 Yes — — 8 (2.0) 3 (3.8) 
 Missing   172 24 
Medical record review subseta
Combined OC usebCombined OC useb
Never/former use (n = 19,953)Recent use (n = 1,999)Never/former use (n = 579)Recent use (n = 103)
n (%)n (%)n (%)n (%)
Agec, y 
 19–29 132 (0.7) 65 (3.3) 13 (2.3) 5 (4.9) 
 30–34 839 (4.2) 302 (15.1) 49 (8.5) 20 (19.4) 
 35–39 2,518 (12.6) 426 (21.3) 140 (24.2) 33 (32.0) 
 40–44 6,185 (31.0) 549 (27.5) 377 (65.1) 45 (43.7) 
 45–50 10,279 (51.5) 657 (32.9) 0 (0.0) 0 (0.0) 
Race 
 White 11,519 (79.8) 1,209 (82.6) 311 (76.8) 53 (79.1) 
 Asian 1,490 (10.3) 121 (8.3) 51 (12.6) 7 (10.4) 
 Black 757 (5.2) 69 (4.7) 27 (6.7) 4 (6.0) 
 Other 674 (4.7) 65 (4.4) 16 (4.0) 3 (4.5) 
 Missing 5,513 535 174 36 
Ethnicity 
 Non-Hispanic 15,083 (95.1) 1,428 (94.4) 401 (95.0) 63 (92.6) 
 Hispanic 775 (4.9) 85 (5.6) 21 (5.0) 5 (7.4) 
 Missing 4,095 486 157 35 
Body mass index (kg/m2, available for reference dates from June 1998 and later)d 
 <25 2,771 (40.9) 425 (46.8) 148 (40.4) 40 (48.8) 
 25.0–29.9 1,862 (27.5) 235 (25.9) 100 (27.3) 22 (26.8) 
 30+ 2,140 (31.6) 249 (27.4) 118 (32.2) 20 (24.4) 
 Missing 2,869 385 38 
Recent screening mammogram (within 18 months before reference date, available for women ≥40 years of age with reference dates from June 1998 and later)e 
 No 5,580 (71.2) 507 (62.5) 186 (75.6) 27 (77.1) 
 Yes 2,256 (28.8) 304 (37.5) 60 (24.4) 8 (22.9) 
Parous 
 No — — 126 (24.7) 42 (42.4) 
 Yes — — 384 (75.3) 57 (57.6) 
 Missing   69 
First-degree family history of breast cancer (includes mother, sisters, and daughters) 
 No — — 416 (91.0) 81 (94.2) 
 Yes — — 41 (9.0) 5 (5.8) 
 Missing   122 17 
First-degree family history of ovarian cancer (includes mother, sisters, and daughters) 
 No — — 399 (98.0) 76 (96.2) 
 Yes — — 8 (2.0) 3 (3.8) 
 Missing   172 24 

Abbreviation: OC, oral contraceptive.

aIncludes up to two of the controls matched to all cases ages 20–44 years with reference dates from May 1995 and later. Information came from medical records and breast cancer screening questionnaires.

bRecent use is defined as filling at least one combined oral contraceptive script in the year before reference date.

cSome controls are outside of the 20–49 age range due to expanded matching criteria.

dBody mass index before reference date (closest to 1 year prior) from medical records and breast cancer screening questionnaires.

eAmong women with 18+ months of enrollment before reference date. Excludes symptomatic and diagnostic mammograms. Mammography data were complete for all women with reference dates from June 1998 and later.

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