Linked Life Data

1983898

Source:http://linkedlifedata.com/resource/pubmed/id/1983898

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1
pubmed:dateCreated
1991-1-17
pubmed:abstractText
Serum sex hormones may be related to the risk of several diseases in postmenopausal women including osteoporosis, heart disease, and breast and endometrial cancer. For assessment of the relation of sex hormones to disease, the measurements should be reliable, valid, and practical. In this paper, the authors evaluated the short-term (4-week) and long-term (2-year) reliability of serum sex hormones and interrelations among serum sex hormones in white postmenopausal women recruited in Pittsburgh, Pennsylvania, 1981-1986. For comparison, the authors simultaneously evaluated the short- and long-term reliability of other commonly measured risk factors, i.e., lipids, lipoproteins, and blood pressure. Serum concentrations of estrone, estradiol, testosterone, and androstenedione were measured by extraction, column chromatography, and radioimmunoassay. Reliability was estimated by calculating the intraclass correlation coefficients (R) and their 95% confidence interval. About 50% of the estradiol levels were below the sensitivity of the assay and, therefore, these results should be interpreted with some caution. The intraclass correlation coefficient for testosterone was 0.92 (95% confidence interval 1.0-0.82), suggesting that a single measure may be reliable in characterizing women for epidemiologic research. Over 4 weeks, estrone could be measured more reliably (R = 0.72) than over 2 years (R = 0.56), but the variability over the long term was similar to that observed for other biologic variables, suggesting that, in situations where the relation between estrone and disease is fairly substantial, a single measure may be used. For estradiol and androstenedione, the intraclass correlations were small, indicating poor reproducibility and the need for more measurements. Estrone concentrations were 11 pg/ml or 46% higher in women with measurable estradiol. Estrone was also positively related to androstenedione concentrations (r = 0.33, p less than 0.001). Concentrations of estradiol are extremely low in postmenopausal women, and accordingly, there is a greater possibility of laboratory error. Since the data suggest that estrone levels can be more reliably measured and are, in fact, related to estradiol levels, it is possible that estrone levels may be used to indicate the total estrogen status of postmenopausal women.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jan
pubmed:issn
0002-9262
pubmed:author
pubmed:issnType
Print
pubmed:volume
133
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
50-7
pubmed:dateRevised
2007-11-14
pubmed:meshHeading
pubmed:year
1991
pubmed:articleTitle
Reliability and interrelations among serum sex hormones in postmenopausal women.
pubmed:affiliation
Department of Epidemiology, Graduate School of Public Health, University of Pittsburgh, PA 15261.
pubmed:publicationType
Journal Article, Comparative Study, Research Support, U.S. Gov't, P.H.S.