STAT210prob3.10: STAT210prob3.10: Electromagnetic Effects on Forearm Disuse...

In thoree/stat340: Data and functions for BIAS at NMBU

STAT210prob3.10: Electromagnetic Effects on Forearm Disuse Osteopenia

Description

An article in Bioelectromagnetics describes a randomized, double-blind, sham-controlled, feasibility and dosing study. They wanted to determine if a common pulsing electromagnetic field (PEMF) treatment could moderate the substantial osteopenia that occurs after forearm disuse. The data in this data set are the percent losses in Bone mineral density (BMD) measurements on the radius after 16 weeks for patients wearing the active or sham PEMF transducers for 1, 2, or 4 hours per day.

Usage

STAT210prob3.10

Format

A data frame with 20 observations (rows) and 4 variables (columns).

	Column name	Data type	Description	Values
[,1]	Sham	numeric	The frequency of the transducers	(2.23 - 9.35)
[,2]	PEMF_1h	numeric	Percent losses in BMD after 16 weeks	(4.09 - 9.94)
[,3]	PEMF_2h	numeric	Percent losses in BMD after 16 weeks	(1.7 - 8.34)
[,4]	PEMF_4h	numeric	Percent losses in BMD after 16 weeks	(4.54 - 8.18)

Details

The subjects in the study were randomized into four groups after a distal radius fracture, or carpal surgery requiring immobilization in a cast. Active or identical sham PEMF transducers were worn on the distal forearm for 1, 2, or 4 hours per day for eight weeks starting after cast removal ("baseline") when bone density continues to decline. Bone mineral density (BMD) and bone geometry were measured in the distal forearm by dual energy X-ray absorptiometry and peripheral quantitative computed tomography. The data were constructed to match the means and standard deviations read from a graph in the paper.

This is data from Exercise 3.10 in Design and Analysis of Experiments, 9th Edition, EMEA Edition.

Source

Montgomery, D. C. (2019) Design and Analysis of Experiments, 9th Edition, EMEA Edition. New York: Wiley.

References

Spadaro, J. A., et al. (2011) Electromagnetic Effects on Forearm Disuse Osteopenia: A Randomized, Double-Blind, Sham-Controlled Study. Bioelectromagnetics, 32, 273–-282.

Examples

# A short summary of the variables
summary(STAT210prob3.10)

# Structure of the object
str(STAT210prob3.10)

thoree/stat340 documentation built on June 30, 2024, 4:04 p.m.