Patient-level, area-level contextual and health system-level characteristics of women undergoing BCS 2002–2013, New South Wales, Australia
| Variable | n (%) |
| Total cohort | 34 458 (100.0) |
| Age (years) | |
| <35 | 579 (1.7) |
| 35–49 | 7308 (21.2) |
| 50–64 | 15 209 (44.1) |
| 65–79 | 9309 (27.0) |
| 80+ | 2053 (6.0) |
| Aboriginal status | |
| Non-Aboriginal | 34 161 (99.1) |
| Aboriginal | 297 (0.9) |
| Country of birth | |
| Australia/New Zealand | 23 746 (68.9) |
| Europe | 4863 (14.1) |
| East Asia | 2217 (6.4) |
| Other | 2808 (8.2) |
| Unknown | 824 (2.4) |
| Tumour type | |
| Invasive | 25 291 (73.4) |
| In situ/in situ component | 9167 (26.6) |
| Previous breast cancer* | |
| No | 34 211 (99.3) |
| Yes | 247 (0.7) |
| Other previous cancer* | |
| No | 34 169 (99.2) |
| Yes | 289 (0.8) |
| No of comorbidities* | |
| No comorbidities | 31 689 (92.0) |
| 1 | 2303 (6.7) |
| 2 | 348 (1.0) |
| 3+ | 118 (0.3) |
| Year of initial BCS | |
| 2002–2005 | 9868 (28.6) |
| 2006–2009 | 11 662 (33.8) |
| 2010–2013 | 12 928 (37.5) |
| Index of Relative Socioeconomic Disadvantage† | |
| Quintile 5 (least disadvantaged) | 12 319 (35.8) |
| Quintile 4 | 7116 (20.7) |
| Quintile 3 | 6860 (19.9) |
| Quintile 2 | 4104 (11.9) |
| Quintile 1 (most disadvantaged) | 4059 (11.8) |
| Hospital type | |
| Public | 15 516 (45.0) |
| Private | 18 942 (55.0) |
| BCS surgical volume‡ | |
| <15 | 3278 (9.5) |
| 15–49 | 12 224 (35.5) |
| 50+ | 18 956 (55.0) |
| Residential and hospital location | |
| Metropolitan × metropolitan | 23 957 (69.5) |
| Metropolitan × non-metropolitan | 1180 (3.4) |
| Non-metropolitan × metropolitan | 2602 (7.6) |
| Non-metropolitan × non-metropolitan | 6719 (19.5) |
*Recorded on or within 12 months prior to initial BCS.
†Index of Relative Socioeconomic Disadvantage for statistical local area of residence.
‡Average annual number of BCS cases per hospital, 2002–2013.
BCS, breast-conserving surgery.