Title of article :
Maximum likelihood estimation of correlation between maximal oxygen consumption and the 6-min walk test in patients with chronic heart failure
Author/Authors :
Corrado Crocettaa* & Nicola Loperfidob، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2009
Pages :
8
From page :
1101
To page :
1108
Abstract :
Maximal oxygen consumption (VO2max) is the standard measurement used to quantify cardiovascular functional capacity and aerobic fitness. Unfortunately, it is a costly, impractical and labour-intensive measure to obtain. The 6-min walk test (6MWT) also assesses cardiopulmonary function, but in contrast to the VO2max test, it is inexpensive and can be performed almost anywhere. Various medical studies have addressed the correlation between VO2max and 6MWT in patients with chronic heart failure. Of particular interest, from a medical point of view, is the conditional correlation between the two measures given the individualʹs height, weight, age and gender. In this paper, we have calculated the maximum likelihood estimate of the conditional correlation in patients with chronic heart failure under the assumption of skew normality. Data were recorded from 98 patients in the Operative Unit of Thoracic Surgery in Bari, Italy. The estimated conditional correlation was found to be much smaller than estimated marginal correlations reported in the medical literature.
Keywords :
correlation , maximal oxygen consumption , 6-min walk test , skew-normal distribution , cardiopulmonary exercise testing
Journal title :
JOURNAL OF APPLIED STATISTICS
Serial Year :
2009
Journal title :
JOURNAL OF APPLIED STATISTICS
Record number :
712350
Link To Document :
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