Table 2.
Select characteristics of study participants, stratified by case-control status
| Variable | Cases (N, %) or (Mean, SD) | Controls (N, %) or (Mean, SD) |
|---|---|---|
| N |
392 |
439 |
| Age (y) |
60.9 (10.3) |
60.2 (10.4) |
| BMI1 (kg/m2) |
25.3 (4.8) |
25.9 (4.9) |
| Parity2 |
|
|
| Nulliparous |
62 (16) |
53 (12) |
| 1-2 pregnancies |
146 (37) |
179 (41) |
| 3+ pregnancies |
184 (47) |
207 (47) |
| Missing |
0 (0) |
0 (0) |
| OC use |
|
|
| Never |
146 (37) |
112 (25) |
| Ever |
245 (63) |
327 (75) |
| Missing |
1 (0) |
0 (0) |
| Family history of ovarian or breast cancer in >1 FDR |
|
|
| No |
290 (74) |
352 (80) |
| Yes |
87 (22) |
75 (17) |
| Missing |
15 (4) |
12 (3) |
| Pack-years smoked3 |
|
|
| None |
224 (57) |
206 (47) |
| < 20 |
68 (17) |
118 (27) |
| > 20 |
98 (25) |
113 (26) |
| Missing |
2 (0) |
2 (0) |
| HT use |
|
|
| Never |
205 (52) |
263 (60) |
| Ever |
187 (48) |
176 (40) |
| Missing | 0 (0) | 0 (0) |
Percentages are rounded and may not add up to 100. Abbreviations used: N, number of observations; SD, standard deviation; OC, oral contraceptive; HT, hormone therapy; FDR, first degree relative.
1BMI was calculated using usual adult or current weight for participants.
2Parity was based on the number of births, regardless of outcome.
3Where “None” is < 100 cigarettes during a lifetime.