Table 1.
Descriptive Characteristics of Study Subjects
| Characteristic | N (%) |
|---|---|
| Study | |
| NYUWHS- OVCA | 163 (26.5) |
| NYUWHS- NHL | 184 (29.9) |
| ORDET | 82 (13.3) |
| NSHDS | 187 (30.4) |
| Age at blood sampling, y | |
| 30–45 | 123 (20.0) |
| 46–50 | 74 (12.0) |
| 51–55 | 101 (16.4) |
| 56–60 | 144 (23.4) |
| 61–75 | 173 (28.1) |
| Missing | 1 |
| Body Mass Index, kg/m2 | |
| <25 | 303 (51.4) |
| 25–29 | 166 (28.1) |
| 30–34 | 89 (15.1) |
| ≥35 | 32 (5.4) |
| Missing | 26 |
| Menopausal Status at Baseline | |
| Premenopausal | 212 (34.5) |
| Postmenopausal | 403 (65.5) |
| Missing | 1 |
| Parity | |
| Nulliparous | 124 (23.1) |
| 1 | 74 (13.8) |
| 2 | 181 (33.7) |
| 3 | 104 (19.4) |
| 4 or more | 54 (10.1) |
| Missing | 79 |
| Family history of breast/ovarian cancera | |
| No | 413 (82.3) |
| Yes | 89 (17.7) |
| Missing | 114 |
| Use of NSAIDs at blood sampling a | |
| No | 446 (83.5) |
| Yes | 88 (16.5) |
| Missing | 82 |
| Smoking status at blood sampling | |
| Never | 287 (56.0) |
| Current | 92 (18.0) |
| Former | 133 (26.0) |
| Missing | 104 |
| Use of vitamins at blood sampling a | |
| No | 308 (58.0) |
| Yes | 223 (42.0) |
| Missing | 85 |
| Past use of oral contraceptives | |
| Never | 344 (64.5) |
| Ever | 189 (35.5) |
| Missing | 83 |
| 25(OH)D status b | |
| ≤ 50 nmol/L (“insufficient”) | 171 (62.9) |
| > 50 nmol/L (“sufficient”) | 101 (37.1) |
| Missing | 344 |
Note: NSAIDs: non-steroidal anti-inflammatory drugs, 25(OH)D: 25-hydroxy vitamin D
a
High proportion of missing data because this variable was not available from ORDET (n=82) subjects.
b
High proportion of missing data because this variable was not available from ORDET (n=82) subjects and from subjects who were not included in previous studies on 25(OH)D.