A new nomogram of urinary flow rate and volume based on multiple measurements per healthy adult Japanese men using a portable uroflowmeter (P-Flowdiary®)

Table 2 Comparison of the coefficients of determination (R²) among the 3 regression models to represent the relationships between voided volume and maximum flow rate

Age groups (years)	Coefficient of determination (R²), mean ± SD
Age groups (years)	Quadratic regression	Linear regression	Logarithmic regression
20–29	0.92 ± 0.06	0.70 ± 0.17****	0.82 ± 0.13**
30–39	0.93 ± 0.06	0.65 ± 0.21****	0.81 ± 0.11**
40–49	0.94 ± 0.05	0.74 ± 0.17****	0.85 ± 0.09*
50–59	0.91 ± 0.07	0.66 ± 0.21****	0.83 ± 0.10
20–59	0.93 ± 0.06	0.69 ± 0.21****	0.83 ± 0.13****

Data are described as mean ± standard deviation
Ordinary 1-way analysis of variance and Dunnett’s multiple comparison test were used
^*P < 0.05, **P < 0.01, ***P < 0.001, ****P < 0.0001: compared with quadratic regression

ISSN: 1471-2490