Objectives: The aims of this study were to analyse the data from frequency–volume charts and to study the reliability of these charts in men with lower urinary tract symptoms (LUTS) due to benign prostatic hyperplasia (BPH).Methods: Males with LUTS due to BPH were consecutively included in the study if they met the criteria of the International Consensus Committee on BPH, voided more than 150 ml during uroflowmetry, residual volume and prostate size were estimated and frequency–volume charts were completed correctly. From the frequency–volume charts, voiding habits and fluid intake were evaluated.Results: 160 patients could be included. Another 28 patients who met all other criteria did not complete the frequency–volume charts correctly. Agreement exists between reported voided volumes in the literature and those found by us. We found a significant correlation (p<0.001) between nycturia and score on symptom question 7, and between diuria and score on symptom question 2 of the AUA symptom index. The difference between results obtained from frequency–volume charts completed during 24 h and those obtained from charts completed during three or more 24–hour periods was negligible with respect to the variation of data at an individual level.Conclusion: Frequency–volume charts are reliable in the investigation of patients with LUTS due to BPH. Reporting on frequency–volume charts during just 24 h is sufficient to gain insight into their voiding habits during normal daily life.

Keywords:
Prostatic hyperplasia, Urination disorders, Questionnaire
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