['Rome III incorporates changes in the definition of functional gastrointestinal disorder that involve a 3-month recall time for symptoms, rather than 1-year.', 'To validate a new version of the Talley-Bowel Disease Questionnaire (Talley-BDQ) and assess the impact of recall time period on the prevalence of symptoms.', 'A sample of community residents were randomly mailed a survey using 1-year (n = 396) or 3-month recall period (n = 374). We evaluated the reliability and the concurrent validity of the two versions of the questionnaire. The proportions of subjects reporting symptoms in the two versions were compared.', 'The median (IQR) kappa on symptom-related questions was 0.70 (0.57-0.76) from the 1-year version and 0.66 (0.56-0.77) from the 3-month version. A median kappa of 0.39 (0.19-0.70) and 0.58 (0.39-0.73) was observed for concurrent validation of the 1-year and 3-month versions respectively. Except for gastro-oesophageal reflux symptoms, no differences were observed on the prevalence of clinically relevant symptoms.'] Is measurement of abdominal symptoms by validated questionnaire : a 3-month recall timeframe as recommended by Rome III superior to a 1-year recall timeframe?