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Four thyroid function indices were determined in the sera of 181 patients: total thyroxine (T-4), the triiodothyronine resin uptake (T-3 B.C.-index), the free thyroxine (T-4) index, and the effective thyroxine ratio (E.T.R.).A statistically significant correlation between the free T-4 index and E.T.R. could be established though this correlation seemed to be worse than could be expected from the literature. Two sets of correlation coefficients were shown: one obtained with the ordinarily used Pearson or product-moment correlation and one with the Spearman rank correlation. Because the assumptions and requirements for the proper use of the product-moment correlation statistics, such as a normal distribution of both variables, are seldom met, expecially not if a selected number of controls and patients is used for the correlation, it is advisable to use some kind of rank correlation statistics instead.The advantages and disadvantages of the E.T.R. and free T-4 index determination are described.
E G D'haene, and
F J Crombag, and
J F Tertoolen
November 1974,
British medical journal,
E G D'haene, and
F J Crombag, and
J F Tertoolen
March 1975,
British medical journal,
E G D'haene, and
F J Crombag, and
J F Tertoolen
November 1974,
British medical journal,
E G D'haene, and
F J Crombag, and
J F Tertoolen
October 1974,
British medical journal,
E G D'haene, and
F J Crombag, and
J F Tertoolen
May 1973,
Clinica chimica acta; international journal of clinical chemistry,
E G D'haene, and
F J Crombag, and
J F Tertoolen
January 1974,
Clinical endocrinology,
E G D'haene, and
F J Crombag, and
J F Tertoolen
January 1973,
Journal belge de radiologie,
E G D'haene, and
F J Crombag, and
J F Tertoolen
February 1977,
South African medical journal = Suid-Afrikaanse tydskrif vir geneeskunde,
E G D'haene, and
F J Crombag, and
J F Tertoolen
March 1974,
Archives of disease in childhood,
E G D'haene, and
F J Crombag, and
J F Tertoolen
March 1973,
JAMA,
