Table 2. Correlations among prostate symptom score, prostate volume and Qmax.

Authors and References	Study design + measurement techniques	IPSS vs. PV			Qmax vs. PV			IPSS vs. Qmax
		r correlation coefficients	P value		r correlation coefficients	P value		r correlation coefficients	P value
Barry et al. (33)	Cli + TAUS	0.09	0.22		−0.14	0.06		−0.07	0.27
Bosch et al. (34)	Cli + TRUS	N/A			−0.05	0.33		N/A
Girman et al. (35)	Com + TRUS	0.185	0.001		−0.214	0.001		−0.350	0.001
Kaplan et al. (36)	Cli + TRUS	0.17	>0.05		−0.20	>0.05		−0.47	<0.05
Ezz el Din et al. (37)	Cli + TRUS	0.03	>0.05		N/A			N/A
Lepor et al. (38)	Cli + TRUS	0.13	>0.05		−0.40	0.001		N/A
Øverland et al. (39)	Com + TRUS	0.176	N/A		N/A			−0.278	N/A
Agrawal et al. (40)	Cli + TAUS	0.191	0.57		−0.413	0.229		N/A
Guneyli et al. (41)	Cli + MRI	0.414	0.001		N/A			N/A

Cli, Clinic-based population; Com, Community-based population; TAUS, transabdominal ultrasound; TRUS, transrectal ultrasound.