Table 1.
Characteristics of postmenopausal women included in the pooled analysis
| Cases |
Controls |
|
|---|---|---|
| N (%) | N (%) | |
| NHL subtype | 2094 (100) | – |
| Diffuse large B-cell lymphoma | 675 (32) | – |
| Follicular lymphoma | 531 (25) | – |
| Other B-cell lymphoma | 480 (23) | – |
| T-cell lymphoma | 83 (4) | – |
| Unclassified | 325 (16) | – |
| Age (years) | 2094 (100) | 2731 (100) |
| ≤55 | 358 (17) | 405 (15) |
| 56–65 | 791 (38) | 1036 (38) |
| >65 | 945 (45) | 1290 (47) |
| Socioeconomic status | 1463 (100) | 1956 (100) |
| High | 328 (22) | 501 (26) |
| Medium | 475 (32) | 691 (35) |
| Low | 655 (45) | 758 (39) |
| Not known | 5 (0.3) | 6 (0.3) |
| Body mass index | 1984 (100) | 2627 (100) |
| Underweight (<18.5 kg m−2) | 36 (2) | 86 (3) |
| Normal (18.5–24.99 kg m−2) | 1014 (51) | 1420 (54) |
| Overweight (25–29.99 kg m−2) | 597 (30) | 751 (29) |
| Obese (≥30 kg m−2) | 312 (16) | 340 (13) |
| Not known | 25 (1) | 30 (1) |
| Hysterectomy | 1098 (100) | 1512 (100) |
| No | 712 (65) | 1016 (67) |
| Yes | 373 (34) | 477 (32) |
| Not known | 13 (1) | 19 (1) |
Socioeconomic status data were collected in seven studies (Mayo, UCSF, Los Angeles, British Columbia, UK, North Italy and Italy), body mass index data in eight studies (Connecticut, Mayo, UCSF, British Columbia, UK, North Italy, Italy and HERPACC2) and hysterectomy data in five studies (Mayo, UCSF, Los Angeles, UK and HERPACC2). NHL, non-Hodgkin lymphoma.