Post-test probability that men in the community with raised plasma ferritin concentrations are hazardous drinkers.

Abstract:

BACKGROUND:Raised plasma ferritin concentrations occur unexpectedly during iron studies done by primary care physicians. Plasma ferritin concentration has been positively associated with alcohol use among men. AIM:To determine the post-test probability that men in the community with raised plasma ferritin concentrations are hazardous drinkers. METHODS:The subjects were 152 men, randomly selected from a city's electoral roll. Nineteen (12.5 (2.7)%, mean (SEM)) admitted to drinking hazardously. The pretest probability of a man being a hazardous drinker was 0.125. This was converted to pretest odds of 0.14. The likelihood ratio (the ratio of the probability of obtaining a raised plasma ferritin concentration in a hazardous drinker (sensitivity) to the probability of obtaining a raised plasma ferritin concentration in a non-hazardous drinker (1-specificity)) was calculated for different plasma ferritin cut off points. RESULTS:A plasma ferritin level of > 652 micrograms/l gave the largest likelihood ratio, 4.16. Post-test odds were obtained by multiplying the pretest odds (0.14) by the likelihood ratio (4.16). A plasma ferritin level of > 652 micrograms/l had a post-test odds for a man being a hazardous drinker of 0.58. This was converted to a post-test probability of 0.37. CONCLUSIONS:Inquiries could usefully be made into the alcohol consumption of men with a plasma ferritin concentration > 652 micrograms/l, as approximately one in three would admit to drinking hazardously.

journal_name

J Clin Pathol

authors

Peach HG,Bath NE

doi

10.1136/jcp.52.11.853

keywords:

subject

Has Abstract

pub_date

1999-11-01 00:00:00

pages

853-5

issue

11

eissn

0021-9746

issn

1472-4146

journal_volume

52

pub_type

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