| Title: |
Can analyses of electronic patient records be independently and externally validated? Study 2—the effect of β-adrenoceptor blocker therapy on cancer survival: a retrospective cohort study |
| Authors: |
Springate, David A; Ashcroft, Darren M; Kontopantelis, Evangelos; Doran, Tim; Ryan, Ronan; Reeves, David |
| Source: |
BMJ Open ; volume 5, issue 4, page e007299 ; ISSN 2044-6055 2044-6055 |
| Publisher Information: |
BMJ |
| Publication Year: |
2015 |
| Description: |
Objectives To conduct a fully independent, external validation of a research study based on one electronic health record database using a different database sampling from the same population. Design Retrospective cohort analysis of β-blocker therapy and all-cause mortality in patients with cancer. Setting Two UK national primary care databases (PCDs): the Clinical Practice Research Datalink (CPRD) and Doctors’ Independent Network (DIN). Participants CPRD data for 11 302 patients with cancer compared with published results from DIN for 3462 patients; study period January 1997 to December 2006. Primary and secondary outcome measures All-cause mortality: overall; by treatment subgroup (β-blockers only, β-blockers plus other blood pressure lowering medicines (BPLM), other BPLMs only); and by cancer site. Results Using CPRD, β-blocker use was not associated with mortality (HR=1.03, 95% CI 0.93 to 1.14, vs patients prescribed other BPLMs only), but DIN β-blocker users had significantly higher mortality (HR=1.18, 95% CI 1.04 to 1.33). However, these HRs were not statistically different (p=0.063), but did differ for patients on β-blockers alone (CPRD=0.94, 95% CI 0.82 to 1.07; DIN=1.37, 95% CI 1.16 to 1.61; p |
| Document Type: |
article in journal/newspaper |
| Language: |
English |
| DOI: |
10.1136/bmjopen-2014-007299 |
| Availability: |
https://doi.org/10.1136/bmjopen-2014-007299; https://syndication.highwire.org/content/doi/10.1136/bmjopen-2014-007299 |
| Accession Number: |
edsbas.6630F7CB |
| Database: |
BASE |