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Rights & Permissions Free Resources Display this book on your site! Related Titles Medicare:A Strategy for Quality Assurance, Volume I Preventing Medication Errors: Quality Chasm Series Other Related Titles Reliability of Medicare Hospital Discharge Records: Report of a Study (1977) Institute of Medicine (IOM) Citation Manager Export the bibliographic data for this book in your chosen format Web Search Builder Use this book's key terms to search within this book, across our collection, or across the Web. Skim This Chapter Skim this chapter and use this chapter's key terms to search within this book. Reference Finder Paste in your own text to find books that relate to your topic. Citation Manager . "Appendix K Standard Errors and Confidence Intervals for Statistics Based on Medicare Data." Reliability of Medicare Hospital Discharge Records: Report of a Study. Washington, DC: The National Academies Press, 1977. Please select a format: Page 129   E-mail Share on facebook Facebook Share on delicious Delicious Share on stumbleupon Stumble Share on twitter Twitter More Sharing ServicesMore Page 129 Front Matter (R1-R6) Table of Contents (R7-R8) Foreword (R9-R10) Introduction (1-4) Study Methods (5-22) Analysis (23-60) Summary and Recommendations (61-70) Appendix A Bibliography (71-72) Appendix B Sample Letter to Hospital Administrators (73-74) Appendix C Diagnostic Codes Included as Components of the Sample of Medicare Records (75-84) Appendix D IOM Re-abstracting Form, General Instructions for Field Team, and Specific Instructions for IOM Re-abstracting Form (85-104) Appendix E Informal Checklist (105-106) Appendix F Reliability of Field Work (107-114) Appendix G Percent of Abstracts with no Discrepancy for each Diagnosis Included as a Component of the Sample of Medicare Records (115-120) Appendix H Net and Gross Difference Rates in Designation of Principal Diagnosis (Based on Four-Digit Comparisons of Specific Diagnosis) (121-124) Appendix I General Comparison of Assessment of the Reliability of Medicare Records Maintained by the Health Care Financing Administration and Hospital Discharge Abstracts Compiled by Private Abstract Services (125-126) Appendix J Comparison of the Reliability of HCFA Medicare Records and Private Abstract Service Medicare Abstracts for Selected Diagnoses Common to both Studies (127-128) Appendix K Standard Errors and Confidence Intervals for Statistics Based on Medicare Data (129-131) Appendix L Standard Errors and Confidence Intervals for Statistics Based on Data from Private Abstracting Services (132-133) Appendix M Selected Examples of Principal Procedures not Listed in CPT, as Determined by the IOM Field Team Members (134-134)

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OCR for page 129
Appendix K* STANDARD ERRORS AND CONFIDENCE: INTERVALS FOR STATISTICS BASEI) ON -tIEE)IeARE DATA ~ ~~~ ~ ~- ~ ~ es t Mate - error S t andard Conf idence - interval Stat Isaac .. . . Percent of abstracts 56 .80 1 .47 54 . 4-59 . 2 with no di screpancy for princ ipal diag- nos is coded to four- dig its Percent of abstracts 78 .40 1. 34 73 . 7-80 .6 with no discrepancy for princ ipal pro- cedu re ~ . .. . .. .. . . . . . . .. . . . *A 0.10 alpha level was used in estimating the confidence intervals given in th i s appendix. 129

OCR for page 130
130 Appendix K STANDARD ERRORS AND CONFIDENCE INTERVALS FOR NET DIFFERENCE RATES - ( TIMES 100) BASEI) ~ ()N -MI: DISARM ~ DATA ~ - ~ ~ .. . . . Diagnosis Point estimate ~ error ~~ Standard ~ Conf idence - interval Chronic ischemic heart -4 .49 0.62 -5 . 51--3 .47 disease - , . Cerebrovascular diseases 2.21 0.45 1 .47-2- .95 Fracture, neck of femur 0 .64 0. 20 ~ 0 . 31-0 . 97 Cataract 0.13 0.07 0.01-0.25 Acute myocardial. 0.57 0.17 0.29-0.85 inf arct ion Inguinal hernia without 0.09 0.06 -0.01-0.19 ment ion of obstruction Diabetes mellitus -0 .23 0.32 -0 . 76-0.30 Hyperp las ia of the 0 . 20 0 .16 -0 . 06-0 .46 prostate Bronchopneumonia- 0.66 0.27 0.21-1.11 organism not spec if fed · ~ and pneumonla-organlsm and type not spec if fed Chole lith ias is / cholecyst it is 0.78 0. 14 0. 55-1 . 01 Intest inal obstruction 0 .24 0 .06 0 . 14-0 . 34 without ment ion of hernia Conges t ive heart fai lure 1 . 71 0 . 26 1. 28-2 . 14 and 1 e ft vent ricu lar fai lure Divert iculos is of 0.47 0. 15 0. 22-0 .72 infest ine Bronchit is 0.23 0. 14 0. 00-0 .46 Malignant neoplasm of 0.13 0 . 08 0. 00-0 . 26 bronchus and lung

OCR for page 131
131 Append ix K STANDARD ERRORS AND CONFIDENCE: INTERVALS FOR GROSS DIFFERENCE: RATES - ~ ~ TIMf:S 100) BASED - ON MI:DICARf: ~ DATA . . . ., ~ . , Point Standard Confidence ~ est Mate ^ error - interval l~tagnos is ~ ~ . Chronic ischemic heart 7.55 0. 37 6.94-8.16 disease Cerebrovascular diseases 4.38 0.23 - 4. 00-4 . 76. Frac Lure , neck of femur 0 . 86 0 .17 0 . 58- 1. 14 Cataract 0.24 0.07 0.12-0.36 Acute myocardial 1.56 0. 23 1. 18-1 .94 inf arct ion Inguinal hernia without 0. 18 0.03 0. 13-0 .23 ment ion of obstruction Diabetes 1.99 0.18 1. 69-2 .29 Hyperp lasia of the 0 . 67 0 .10 0 . 50-0 . 84 prostate Bronchopneumonia- 1.85 0.47 1. 07-2 .63 organism not spec if fed . . . ana pneumon~a-organlsm and type not spec if fed Cholelithiasis/ 1.34 0.29 0.86-1.82 cho lecyst it is Intest inal obstruct ion 0. 71 0. 11 0. 53-0 .89 without ment ion of hernia Congestive heart failure 2.89 0.42 2.20-3.58 and le. ft vent ricu tar fai lure Diverticulosis of 0.85 0.17 0.57-1.13 infest ine Bronchitis 0.80 0.26 0.37-1 .23 Malignant neoplasm of 0 . 38 0 . 05 0 .30-0 .46 bronchus and lung

Representative terms from entire chapter:

ischemic heart