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doi: 10.1097/MLR.0b013e31824deff9
Applied Methods

Establishment of an 11-Year Cohort of 8733 Pediatric Patients Hospitalized at United States Free-standing Children’s Hospitals With De Novo Acute Lymphoblastic Leukemia From Health Care Administrative Data

Fisher, Brian T. DO, MSCE*,†,‡,§; Harris, Tracey BSc; Torp, Kari BA; Seif, Alix E. MD, MPH‡,∥; Shah, Ami BS, BA; Huang, Yuan-Shung V. MS*,†; Bailey, L. Charles MD, PhD‡,∥; Kersun, Leslie S. MD, MSCE‡,∥; Reilly, Anne F. MD, MPH‡,∥; Rheingold, Susan R. MD‡,∥; Walker, Dana MD‡,∥; Li, Yimei PhD; Aplenc, Richard MD, PhD‡,§,∥,¶

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Background: Acute lymphoblastic leukemia (ALL) accounts for almost one quarter of pediatric cancer in the United States. Despite cooperative group therapeutic trials, there remains a paucity of large cohort data on which to conduct epidemiology and comparative effectiveness research studies.

Research Design: We designed a 3-step process utilizing International Classification of Diseases-9 Clinical Modification (ICD-9) discharge diagnoses codes and chemotherapy exposure data contained in the Pediatric Health Information System administrative database to establish a cohort of children with de novo ALL. This process was validated by chart review at 1 of the pediatric centers.

Results: An ALL cohort of 8733 patients was identified with a sensitivity of 88% [95% confidence interval (CI), 83%–92%] and a positive predictive value of 93% (95% CI, 89%–96%). The 30-day all cause inpatient case fatality rate using this 3-step process was 0.80% (95% CI, 0.63%–1.01%), which was significantly different than the case fatality rate of 1.40% (95% CI, 1.23%–1.60%) when ICD-9 codes alone were used.

Conclusions: This is the first report of assembly and validation of a cohort of de novo ALL patients from a database representative of free-standing children’s hospitals across the United States. Our data demonstrate that the use of ICD-9 codes alone to establish cohorts will lead to substantial patient misclassification and result in biased outcome estimates. Systematic methods beyond the use of just ICD-9 codes must be used before analysis to establish accurate cohorts of patients with malignancy. A similar approach should be followed when establishing future cohorts from administrative data.

© 2014 by Lippincott Williams & Wilkins.


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