Abstract：
:The standardized mortality ratio (SMR) is the ratio of the number of deaths observed (D) to the number expected (E), on the basis of the mortality rates of some reference population. Several procedures have been proposed in order to test its significance and to estimate its confidence intervals. In this study, the SMR of two causes of death in 27 health areas of Castilla-La Mancha have been calculated. The significance has been evaluated by exact Poisson test and by four methods approximating the Poisson distribution by the normal: 1) a Z statistic based on the assumption that a Poisson variate with expectation E has a standard deviation equal to square root of E; 2) the Z statistic with a continuity correction; 3) a Z statistic based on the square root transformation of a Poisson variable and 4) an approximation of the exact test by Byar. Also, the confidence intervals have been estimated by exact method and by three approximate procedures: 1) by Byar; 2) by Z statistic uncorrected and 3) by the square root transformation of the Poisson distribution. With the exact methods and Byar procedure the results were very similar; therefore, using the last to testing significance and estimate the confidence intervals of SMR, is suggested.
journal_name
Gac Sanitjournal_title
Gaceta sanitariaauthors
Regidor E,de Mateo S,Rodríguez C,Gutiérrez-Fisac JLdoi
10.1016/s0213-9111(93)71156-5subject
Has Abstractpub_date
1993-09-01 00:00:00pages
237-43issue
38eissn
0213-9111issn
1578-1283pii
S0213-9111(93)71156-5journal_volume
7pub_type
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