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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 129
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 129
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