Measuring the effect of a worksite-based nutrition intervention on food consumption.
Ann Epidemiol
; 3(6): 629-35, 1993 Nov.
Article
in En
| MEDLINE
| ID: mdl-7921311
ABSTRACT
Although current dietary guidelines focus on a combination of specific nutrients and food items, most effective dietary interventions focus on patterns of dietary intake and take into account the relationships among nutritional factors. In a controlled nutrition intervention conducted at 16 workplaces, a self-administered health habits questionnaire (HHQ) including a 67-item version of a semiquantitative food frequency questionnaire (FFQ) was distributed prior to a 15-month intervention and again after it. Principal components analysis (PCA) was used to reduce this large set of highly correlated FFQ food items to a smaller set of maximally uncorrelated components (PCs). Of the eight discrete food-based eating patterns targeted in the Treatwell intervention, six were highly correlated ([r[ > or = 0.48) with at least one PC each. This indicates a high level of concordance between a priori intervention targets and actual behavior. Based on log-transformed preintervention FFQ measures, our results showed that a very high proportion (0.55) of the variance in the FFQ data was explained by the PCs. A significantly greater increase in consumption of total vegetables and a larger decrease in dietary intake of ground and processed meats were observed among intervention companies. A comparison PCA conducted on intervention and control companies after the intervention indicated that patterns of intake were very stable over time.
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Collection:
01-internacional
Database:
MEDLINE
Main subject:
Feeding Behavior
/
Health Promotion
/
Nutritional Physiological Phenomena
Type of study:
Clinical_trials
/
Prognostic_studies
/
Qualitative_research
Limits:
Humans
Language:
En
Journal:
Ann Epidemiol
Year:
1993
Document type:
Article