Table 1.
Baseline and tumor characteristics of the breast cancer survivors
| All women N = 13,624 | |
|---|---|
| Demographic and lifestyle factors | N(%) |
| Highest school level | |
| None/primary school completed | 3400 (26.2) |
| Technical/professional school | 3121 (24.1) |
| Secondary school | 3255 (25.1) |
| Longer education (including university degree) | 3196 (24.6) |
| Smoking status and intensity of smoking | |
| Never | 6086 (44.7) |
| Current, 1–15 cig/day | 1636 (12.0) |
| Current, 16–25 cig/day | 768 (5.6) |
| Current, 26 + cig/day | 136 (1.0) |
| Former, quit < = 10 years | 1086 (8.0) |
| Former, quit 11–20 years | 1013 (7.4) |
| Former, quit 20 + years | 1125 (8.3) |
| Miscellaneous | 1515 (11.1) |
| Alcohol consumption gr/day | |
| Non drinker | 1830 (13. 6) |
| > 0–3 | 3889 (28.8) |
| > 3–12 | 4119 (30.5) |
| > 12–24 | 2086 (15.5) |
| > 24 | 1570 (11.6) |
| Physical activity | |
| Inactive | 2784 (20.8) |
| Moderately inactive | 4824 (36.0) |
| Moderately active | 3674 (27.4) |
| Active | 2117 (15.8) |
| Menopausal status at diagnosis | |
| Premenopausal | 2945 (21.6) |
| Postmenopausal | 10,679 (78.4) |
| Ever taken menopausal hormone therapy | |
| No | 7682 (56.4) |
| Yes | 5449 (40.0) |
| Clinical and histological features of the tumor | N(%) |
| Grade | |
| Well differentiated | 1323 ( 9.7) |
| Moderately differentiated | 2991 (21.9) |
| Poorly differentiated/Undifferentiated | 2549 (18.7) |
| Not determined | 6761 (49.6) |
| Stage | |
| Stage 0/I | 1984 (14.6) |
| Stage II | 1624 (11.9) |
| Stage III | 312 ( 2.3) |
| Non-metastatic unknown stage1 | 4101 (30.1) |
| Stage IV (metastatic) | 1814 (13.3) |
| Unknown | 3789 (27.8) |
| Estrogen receptor status | |
| Negative | 1718 (12.6) |
| Positive | 7723 (56.7) |
| Unknown | 4183 (30.7) |
| Progesterone receptor status | |
| Negative | 2676 (19.6) |
| Positive | 5183 (38.0) |
| Unknown | 5765 (42.3) |
| Human epidermal receptor 2 status | |
| Negative | 3679 (27.0) |
| Positive | 870 ( 6.4) |
| Unknown | 9075 (66.6) |
The number of missing observations for Highest school level, Smoking status and intensity of smoking, Alcohol consumption, Physical activity and Ever taken menopausal hormone therapy were 652, 259, 130, 225 and 493, respectively
1Non-metastatic unknown stage category includes all tumors without distant metastases (M0) with insufficient information on the size of the tumor (T) and regional lymph node status (N), to be classified within the specific stage I, II or III