Abstract
Citation
Prochaska JJ, Sallis JF, Rupp J. Screening measure for assessing dietary fat intake among adolescents. Prev Med 2001 Dec;33(6):699-706.
Abstract
BACKGROUND: Clinical preventive guidelines recommend that health care providers counsel adolescents on nutrition. Brief, accurate, and reproducible dietary assessments are needed. The purpose of the current pair of studies was to develop a dietary fat screening measure for use with adolescents. METHODS: Two measures were developed-a 21-item and a 4-category measure. The measures differed in the level at which fat consumption was assessed (food item vs food group). Study 1 (N = 231, age M = 15 years, 57% female, 41% Euro-American) evaluated reliability. Study 2 (N = 59, age M = 14 years, 63% female, 37% Euro-American) evaluated construct validity and correct classification rates. RESULTS: Internal consistencies (alpha > 0.70) and test-retest reliabilities (ICC > 0.60) were adequate for both measures. Neither measure correlated with total fat assessed by a 3-day food record (P > 0.05). The 21-item measure correlated significantly with percentage of calories from fat (r = 0.36, P <.01). Correct classification rate (71%) and sensitivity (81%) of the 21-item measure were good. Specificity (47%) was lower, indicating some subjects with a low-fat diet were misclassified by the screening measure. CONCLUSIONS: The 21-item measure is quick to complete and score, is inexpensive to reproduce, and has demonstrated reliability and validity. The measure could be clinically useful, but further improvements should be attempted to improve specificity.
Full Text
The full text is available at https://dx.doi.org/10.1006/pmed.2001.0951
At A Glance
Individual Dietary Behavior Variables
| Intake |
|---|
| Total fat grams, percentage of calories from total fat |
Domain(s)
Individual Dietary Behavior
Measure Type
Questionnaire
Measure Availability
Measure included in article
Number of Items
21 Reported
Study location
Metro/Urban
San Diego, CA, USA
Pittsburgh, PA
Languages
English
Information about Development of Measure
The Block Simplified Fat Screener, developed for adults, was modified for use with adolescents.
Study Design
Study Participants
Age
12 - 18 Years
Sex
Female
Male
Race/Ethnicity
Hispanic
White
Black/African American
Asian
Hawaiian/Other Pacific Islander
Predominantly Low-income/Low-SES
Not reported
Sample Size
231
Study Design
Design Type
Validation/Reliability
Health Outcomes Assessed
None
Obesity Measures
Not applicable
BMI Measured or Self-reported
Not applicable
Covariates
Not reported
Data Reported on Race/Ethnicity
Quantitative data on study sample
Data Reported on SES
Not applicable
SES-related Variables
Not applicable
How To Use
Administration
Who Administered
Self-administered
How Administered
In-person
Time Required
5-10 minutes
Training Required
Not reported
Instructions on Use
Instructions on instrument use included in article
Data Analysis
Data Collection/Analysis Costs
Not available
Data Collection/Protocol
Subjects completed the measure twice at an approximate interval of 2 weeks.
Instructions on Data Analysis
Instructions on analysis included in article
Validity (1)
| Type of validity | Construct/subscale assessed | Criterion measure used | Test/statistic used | Result |
|---|---|---|---|---|
| Criterion | Percentage of calories from dietary fat | 3-day food record | Pearson correlation coefficient | r= 0.36, p<0.01 |
Reliability (7)
| Type of reliability | Construct/subscale assessed | Test/statistic used | Result |
|---|---|---|---|
| Test-retest | 21-item fat measure- Full sample | Intraclass correlation coefficient | 0.64 |
| Test-retest | 21-item fat measure- 7-8 grade girls | Intraclass correlation coefficient | 0.65 |
| Test-retest | 21-item fat measure- 7-8 grade boys | Intraclass correlation coeefficient | 0.62 |
| Test-retest | 21-item fat measure- 9-12 grade boys | Intraclass correlation coefficient | 0.55 |
| Test-retest | 21-item fat measure- 9-12 grade girls | Intraclass correlation coefficient | 0.68 |
| Internal Consistency | 21-item fat measure- Time 1 | Cronbach's alpha | 0.88 |
| Internal Consistency | 21-item fat measure- Time 2 | Cronbach's alpha | 0.87 |