Related Experiment Video
Updated: Aug 11, 2026

Precision Implementation of Minimal Erythema Dose (MED) Testing to Assess Individual Variation in Human Inflammatory Response
Published on: October 3, 2019
Comparing two methods of measuring legislation compliance among indoor tanning facilities
Ami L Hurd1, Joni A Mayer, Susan I Woodruff
1Graduate School of Public Health, San Diego State University, San Diego, California 92182-4162, USA.
Background:
Accurate measurement of compliance by tanning facilities to indoor tanning legislation is important.
Objective:
This study compared a telephone-based measurement procedure with a face-to-face visit.
Methods:
Indoor tanning facilities (N = 115) in San Diego County, California, were contacted by two adolescents posing as prospective customers using each method. Two compliance variables were assessed: number of times one can tan during 1 week and written parental consent for minors.
Results:
Facility compliance with the frequency variable by face-to-face and telephone was 25.5% and 17.5%, respectively. These rates for the parental consent variable were 73.3% and 80.8%, respectively. Percent agreement between data collection methods was 71.3% for compliance with the frequency recommendation and 76.3% for parental consent regulation. Although traditional statistical tests indicated poor concordance, an alternative test indicated good concordance.
Limitations:
Levels of concordance for the confederates differed.
Conclusion:
Telephone assessment of compliance is fairly comparable with the more labor-intensive, face-to-face assessment.
Related Concept Videos
Measurement: Derived Units
Comparing Experimental Results: Student's t-Test
