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Fig. 1 | BMC Health Services Research

Fig. 1

From: A methodology to extract outcomes from routine healthcare data for patients with locally advanced non-small cell lung cancer

Fig. 1

Schematic showing back-dating intervals used for optimization of key time points extracted from routine data. The date of biopsy is taken to be the date of diagnosis, so long as this date is within a 6 week period of an OPCS code indicating the start of primary treatment. If there is no biopsy date, then any diagnostic event or relevant ICD 10 code (whichever occurs first) occurring within a 6 week period prior to an OPCS code indicating the start of primary treatment is taken to be the date of diagnosis of primary disease. For example, an OPCS code for investigative imaging occurring within 6 weeks prior to treatment, implies there was already clinical suspicion of malignancy at the time of that scan. For the date of recurrence, progressive or metastatic disease, any diagnostic event or ICD10 code (whichever occurs first) occurring within a 6 week period prior to an OPCS code indicating the start of secondary treatment is taken to be the date of recurrence. Any treatment event occurring after 10 weeks after completion of primary treatment was interpreted as secondary treatment. If no secondary treatment has been given then a secondary malignancy ICD 10 code (Additional file 5) can be used to identify recurrent disease

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