Table 1 Variables of interest
From: An ongoing case-control study to evaluate the NHS breast screening programme
Patient characteristics | Primary breast tumour attributes | Screening data |
|---|---|---|
(all primary breast tumours) | ||
Patient unique ID | Tumour unique ID | NHS registration by age 47 |
NHS number | Tumour status (in situ or invasive) | Screening office/centre |
Gender | ICD10 code | Episode date |
Case or Control | Date of tumour diagnosis | Screen / Test date |
Date of birth | Tumour detection mode | Screen / Test outcome |
Patient status (alive or dead at end of study period) | Treatment | |
Cause of death – Breast cancer (where applicable) | Tumour size | |
Date of death (where applicable) | Number of lymph nodes | |
Age at death (where applicable) | Stage | |
Date of tumour diagnosis / pseudo-diagnosis | Grade | |
Age at tumour diagnosis / pseudo-diagnosis | ||
Cancer registry | ||
Geographical area | ||
IMD (Postcode-based) |