Table 3. Comparison of the clinical characteristics between IC/BPS patients with a higher and lower of median serum NGF levels.

	Lower serum NGF (n = 15)	Higher serum NGF (n = 15)	P value
Age	45.4±9.50	58.7±20.8	0.102
O’Leary-Sant Score	24.1±3.50	23.3±4.03	0.650
VAS pain score	5.0±2.42	4.11±2.32	0.398
Cystometric capacity	200±84.8	292±105	0.035
Qmax	11.3±5.32	13.3±5.92	0.401
PVR	20.4±40.5	62.2±54.3	0.051
Functional capacity	142±81.7	125±96.2	0.665
Frequency	12.7±3.59	11.3±2.87	0.357
Nocturia	4.08±1.55	3.11±1.54	0.165
Maximal bladder capacity	577±128	617±189	0.562
Glomerulation degree	2.08±0.75	1.78±0.83	0.392
Ulcer type case	1	0
Serum NGF	2.07±1.18	4.13±1.02	<0.0001

Qmax: maximum flow rate, VAS: visual analog score, PVR: postvoid residual, NGF: nerve growth factor.