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Table 2 Randomization description

From: A randomized study of telephonic care support in populations at risk for musculoskeletal preference-sensitive surgeries

Wave

Start month

Allocation ratio

Stratifying variables

Wave 1

Nov-04

3:1

Age category and gender

Wave 2

Dec-04

45:55

Age category, gender, and Medicare Advantage coverage flag

Wave 3

May-05

3:1

Gender, Medicare Advantage coverage flag and claims-based cluster variable*

Wave 4

May-05

1:1

Gender and claims-based cluster variable*

  1. *Developed with SAS fastclus procedure using predicted costs, inpatient admissions, ED and specialist visits in prior 12 months at time of randomization.
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BMC Medical Informatics and Decision Making

ISSN: 1472-6947

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