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Effect of questionnaire structure on recall of drug utilization in a population of university students.

Gama H, Correia S, Lunet N - BMC Med Res Methodol (2009)

Bottom Line: The following prevalences were greater among participants completing questionnaire A: use of drugs from two or more pharmacological groups (60.5% vs. 34.4%, p < 0.001), use of two or more drugs (66.2% vs. 43.0%, p < 0.001), and use of antibiotics (14.6% vs. 6.9%, p = 0.001), antifungals (9.4% vs. 4.0%, p = 0.013), antiparasitics (5.6% vs. 1.8%, p = 0.031) and antacids (8.6% vs. 3.6%, p = 0.024).Information about duration of treatment and medical advice was more complete with version A.The indication/drug-specific questions (questionnaire A) revealed a significantly higher prevalence of use of medicines - antibiotics, antifungals, antiparasitics and antacids - without compromising the completeness of the information.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Hygiene and Epidemiology, University of Porto Medical School, Porto, Portugal. helena.gama@bial.com

ABSTRACT

Background: Self-reported data are a common source of information about drug exposure. Modes of data collection differ considerably and the questionnaire's structure may affect prevalence estimates. We compared the recall of medication use evaluated by means of two questionnaires differing in structure and length.

Methods: Drug utilization was assessed by two alternative versions of a questionnaire (A - 4 pages, including specific questions for 12 indications/pharmacological groups and one question for "other medicines"; B - 1 page, including 1 open-ended question to cover overall drug consumption). Each of 32 classes in a private University in Maputo, Mozambique, was randomly assigned questionnaire A (233 participants) or B (276 participants). Logistic regression (allowing for clustering by classroom) was used to compare the two groups in terms of socio-demographic characteristics and medication used during the previous month.

Results: Overall, 67.4% of the subjects had used at least one drug during the previous month. The following prevalences were greater among participants completing questionnaire A: use of drugs from two or more pharmacological groups (60.5% vs. 34.4%, p < 0.001), use of two or more drugs (66.2% vs. 43.0%, p < 0.001), and use of antibiotics (14.6% vs. 6.9%, p = 0.001), antifungals (9.4% vs. 4.0%, p = 0.013), antiparasitics (5.6% vs. 1.8%, p = 0.031) and antacids (8.6% vs. 3.6%, p = 0.024). Information about duration of treatment and medical advice was more complete with version A.

Conclusion: The indication/drug-specific questions (questionnaire A) revealed a significantly higher prevalence of use of medicines - antibiotics, antifungals, antiparasitics and antacids - without compromising the completeness of the information.

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Related in: MedlinePlus

Flowchart of the sampling strategies.
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Figure 1: Flowchart of the sampling strategies.

Mentions: Students enrolled at a private University in Maputo, Mozambique were investigated in April 2007. Socio-demographic details and information regarding the drugs used during the previous month (when applicable) were collected using a self-administered questionnaire presented to all diurnal classes, with the consent of the teachers. The questionnaire was given to all the students present in each class. No attempt was made to contact those who were absent. Ten students (1.9% of all invited) refused to participate (1.7% of those receiving questionnaire A and 2.1% of those receiving questionnaire B) and 509 were evaluated, approximately 50% of the total number of students in the institution who were enrolled in diurnal classes (Figure 1).


Effect of questionnaire structure on recall of drug utilization in a population of university students.

Gama H, Correia S, Lunet N - BMC Med Res Methodol (2009)

Flowchart of the sampling strategies.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC2713272&req=5

Figure 1: Flowchart of the sampling strategies.
Mentions: Students enrolled at a private University in Maputo, Mozambique were investigated in April 2007. Socio-demographic details and information regarding the drugs used during the previous month (when applicable) were collected using a self-administered questionnaire presented to all diurnal classes, with the consent of the teachers. The questionnaire was given to all the students present in each class. No attempt was made to contact those who were absent. Ten students (1.9% of all invited) refused to participate (1.7% of those receiving questionnaire A and 2.1% of those receiving questionnaire B) and 509 were evaluated, approximately 50% of the total number of students in the institution who were enrolled in diurnal classes (Figure 1).

Bottom Line: The following prevalences were greater among participants completing questionnaire A: use of drugs from two or more pharmacological groups (60.5% vs. 34.4%, p < 0.001), use of two or more drugs (66.2% vs. 43.0%, p < 0.001), and use of antibiotics (14.6% vs. 6.9%, p = 0.001), antifungals (9.4% vs. 4.0%, p = 0.013), antiparasitics (5.6% vs. 1.8%, p = 0.031) and antacids (8.6% vs. 3.6%, p = 0.024).Information about duration of treatment and medical advice was more complete with version A.The indication/drug-specific questions (questionnaire A) revealed a significantly higher prevalence of use of medicines - antibiotics, antifungals, antiparasitics and antacids - without compromising the completeness of the information.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Hygiene and Epidemiology, University of Porto Medical School, Porto, Portugal. helena.gama@bial.com

ABSTRACT

Background: Self-reported data are a common source of information about drug exposure. Modes of data collection differ considerably and the questionnaire's structure may affect prevalence estimates. We compared the recall of medication use evaluated by means of two questionnaires differing in structure and length.

Methods: Drug utilization was assessed by two alternative versions of a questionnaire (A - 4 pages, including specific questions for 12 indications/pharmacological groups and one question for "other medicines"; B - 1 page, including 1 open-ended question to cover overall drug consumption). Each of 32 classes in a private University in Maputo, Mozambique, was randomly assigned questionnaire A (233 participants) or B (276 participants). Logistic regression (allowing for clustering by classroom) was used to compare the two groups in terms of socio-demographic characteristics and medication used during the previous month.

Results: Overall, 67.4% of the subjects had used at least one drug during the previous month. The following prevalences were greater among participants completing questionnaire A: use of drugs from two or more pharmacological groups (60.5% vs. 34.4%, p < 0.001), use of two or more drugs (66.2% vs. 43.0%, p < 0.001), and use of antibiotics (14.6% vs. 6.9%, p = 0.001), antifungals (9.4% vs. 4.0%, p = 0.013), antiparasitics (5.6% vs. 1.8%, p = 0.031) and antacids (8.6% vs. 3.6%, p = 0.024). Information about duration of treatment and medical advice was more complete with version A.

Conclusion: The indication/drug-specific questions (questionnaire A) revealed a significantly higher prevalence of use of medicines - antibiotics, antifungals, antiparasitics and antacids - without compromising the completeness of the information.

Show MeSH
Related in: MedlinePlus