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Table 5 Information about the duration of treatment with medication used during the previous month, according to the type of questionnaire.

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

  Missing information regarding
duration of treatment, n (%)
Median duration
of treatment (days)
  Questionnaire Questionnaire
  A B A B
Analgesics 9 (8.0) 21 (17.1) 3 2
Antibiotics 2 (5.9) 4 (21.0) 7 7
Antifungals 1 (4.5) 4 (36.4) 14 7
Antiparasitics 2 (15.4) 0 (0.0) 3 3
Antimalarials 0 (0.0) 2 (40.0) 3.5 1
Vitamins 3 (7.9) 7 (25.0) 15 7
Antiasthmatics 0 (0.0) 3 (30.0) 3.5 15
Antihistamines 4 (11.8) 13 (38.2) 4 3
Contraceptives * 2 (14.3) 0 (0.0) 30 † 30 †
Antitussives 0 (0.0) 0 (0.0) 5 10.5
Antacids 1 (5.0) 2 (20.0) 3 4.5
  1. * Information on the use of contraceptives refers only to the female participants; † questionnaire completion examples included oral contraceptives with an exposure period defined as daily, which probably induced respondents to frame a 30-day duration of treatment.