International Journal of Epidemiology, Vol 28, 809-815, Copyright © 1999 by International Epidemiological Association
G Maudsley and EM Williams
BACKGROUND: In cancer registration, data cleaning (i.e. amendments made by
data users to datasets released by registries) is potentially informative
for quality assurance, but generally underreported. AIM: To assess the
scope for learning lessons about cancer registration quality assurance from
a data user (using skin cancer as the example). METHODS: The main design
features were: (i) A descriptive study identifying, qualitatively and
quantitatively, the breadth, depth, and impact of quality assurance issues
raised by a user cleaning Merseyside and Cheshire Cancer Registry skin
cancer data. Errors were rectified and pitfalls for interpretation were
identified. (ii) A nested validation of morphology and site coding on
random samples of cutaneous malignant melanomas, basal cell carcinomas
(BCC), and squamous cell carcinomas. The 33132-record dataset comprised:
all registered skin lesions, except metastases; most recorded variables
(about patient, lesion, treatment, outcome); for Merseyside and Cheshire
residents diagnosed 1970-1991. RESULTS: (i) Ineligible cases represented
0.3% (97/33132), and were detected best by morphology checks. Most quality
assurance issues identified related to local custom and practice, staff
training, and computerization, being particularly illustrated by
problematic BCC registration practice (e.g. records written over
unchallenged by range checks; and idiosyncratic use of variables). (ii)
Post-cleaning, morphology coding errors were minimal in the random samples.
CONCLUSION: There is great scope for data users to contribute to cancer
registration quality assurance. Ultimately, the study dataset appeared fit
for epidemiological analysis and important quality assurance messages
emerged. Shared explicit standard guidelines for data preparation and
validation are needed by users, whose insights could and should be better
recognized by cancer registries.
ARTICLES
What lessons can be learned for cancer registration quality assurance from data users? Skin cancer as an example
Public Health, Quadrangle, The University of Liverpool, UK.
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