Hypothesis testing II: means.

Whenever means are reported in the literature, they are likely accompanied by tests to determine statistical significance. The t test is a common method for statistical evaluation of the difference between two sample means. It provides information on whether the means from two samples are likely to be different in the two populations from which the data originated.

An introduction to biostatistics.

This introduction to biostatistics and measurement is the first in a series of articles designed to provide Radiology readers with a basic understanding of statistical concepts. Although most readers of the radiology literature know that application of study results to their practice requires an understanding of statistical issues, many may not be fully conversant with how to interpret statistics. The goal of this series is to enhance the ability of radiologists to evaluate the literature competently and critically, not make them into statisticians.

Does training in the Breast Imaging Reporting and Data System (BI-RADS) improve biopsy recommendations or feature analysis agreement with experienced breast imagers at mammography?

Purpose: To determine whether training in the Breast Imaging Reporting and Data System (BI-RADS) improves observer performance and agreement with the consensus of experienced breast imagers with regard to mammographic feature analysis and final assessment.

Materials And Methods: A test set of mammograms was developed, with 54 proven lesions consisting of 28 masses (nine [32%] malignancies) and 26 microcalcifications (10 [38%] malignancies). Three experienced breast imagers reviewed cases independently and by means of consensus.

Comparison of heel ultrasound and finger DXA to central DXA in the detection of osteoporosis. Implications for patient management.

The goal of the study was to investigate the potential discordance in patient management when a clinician assumes that a peripheral device is a diagnostic surrogate for central DXA in the detection and treatment of osteoporosis. Over a period of 2 mo, asymptomatic women seeking conventional central DXA evaluation for osteoporosis at a diagnostic imaging center were also evaluated with heel ultrasound and finger DXA peripheral imaging devices. T-Scores of -2.

Compliance with prompt payment legislation: the initial experiences of New Jersey radiologists.

Objective: Prompt payment has emerged as a dominant issue in managed care reform, with 47 states passing laws or regulations requiring prompt remuneration for medical services. The New Jersey Prompt-Pay Act, effective on December 28, 1999, requires payment within 30 days of electronic submission and within 40 days for nonelectronic submission. This study was undertaken to assess compliance with the New Jersey Prompt-Pay Act for radiology claims submitted 1 and 5 months after implementation (7-11 months after passage of the statute).