Uroflow nomogram for healthy, 15-40 year old Indian men

Uroflowmetry is the objective method of measuring rate of urine flow. Nomograms are required to observe the change in flow rates at different voided volumes (VVs) and the use of which overcomes the limitation of referencing flow rates to any single VV. The purpose of the present study was to construct the Indian uroflow nomogram for adult healthy males between 15-40 years of age.

A total of 1000 healthy males between 15 and 40 years of age were included in the study. Exclusion criteria were any urinary symptoms or urological intervention. Parameters analyzed statistically were age, peak flow rate (Q_max), average flow rate (Q_avg), and VV. A nomogram was drawn for the fitted regression model.

The mean age was 27.26 ± 6.71 years. The mean Q_max, Q_avg, and VV were 24.32 ± 3.50 ml/s, 9.45 ± 2.55 ml/s, and 420.93 ± 97.89 ml, respectively. The correlation between flow rates and VV was statistically significant, indicating that the higher the VV, the higher the flow rates. A negative significant correlation of Q_max with age was seen in our study. We observed a decline of Q_max by 1 ml/s/decade. The relationship of Q_max with VV is in linear progression up to 600 ml, and then it becomes a plateau and with higher VV it declined.

Q_max exhibits significant correlation with VV and age. A nomogram was constructed to attain normal reference values of flow rate over different VVs.