Washington Inpatient Atlas Project (WIAP)

Following an introductory document, a series of research briefs, describes the geographic and historical variation in the usage rate of a specific inpatient surgical procedure in Washington State. Each brief includes four charts:

• the statewide rates by sex and age bracket over the period 1990-2005,
• the statewide rates for each year from 1990-2005 adjusted for age and sex with confidence intervals,
• the regional rates adjusted for age and sex in 2005 with confidence intervals, and
• the regional rates adjusted for age and sex for each year in the period 1990-2005.

There are many possible explanations for the observed variations. These studies do not make any conclusions as to why the variations exist. The purpose is to display them and hopefully to stimulate discussion.

A: Introduction and Background of the Washington Inpatient Atlas Project (WIAP)

B: WIAP Coronary Artery Bypass Graft (CABG): 1990-2005

C: WIAP Percutaneous Transluminal Coronary Angioplasty (PTCA): 1990-2005

D: WIAP Total Knee Replacement: 1990-2005

E: WIAP Total Hip Replacement: 1990-2005

F: WIAP Cholecystectomy (Gallbladder Removal): 1990-2005

G: WIAP Hysterectomy: 1990-2005

H: WIAP Appendectomy: 1990-2005

I: WIAP Tonsillectomy: 1990-2005

J: Summary of Findings for Eight Surgical Procedures in Washington State: 1990-2005

Last modified: December 10, 2008
E-mail: OFM.Forecasting@ofm.wa.gov