Table 1. Demographic characteristics of subjects with bladder pain syndrome/interstitial cystitis and comparison subjects (n = 2100).

Variable	Subjects with bladder pain syndrome/interstitial cystitis (n = 350)		Comparison subjects (n = 1750)		p value
	Total no.	Percent (%)	Total no.	Percent (%)
Age (years)					>0.999
<40	84	24.0	420	24.0
40∼49	90	25.7	450	25.7
50∼59	87	24.9	435	24.9
60∼69	58	16.6	290	16.6
70∼79	31	8.9	155	8.9
Urbanization level					0.008
1 (most urbanized)	140	40.0	566	32.3
2	89	25.4	512	29.3
3	40	11.4	266	15.2
4	56	16.0	230	13.1
5 (least urbanized)	25	7.1	176	10.1
Monthly income					0.007
NT$1∼15,840	159	45.4	675	38.6
NT$15,841∼25,000	137	39.1	686	39.2
≥NT$25,001	54	15.4	389	22.2
Geographic region					0.159
Northern	196	56.0	868	49.6
Central	73	20.9	398	22.7
Southern	76	21.7	448	25.6
Eastern	5	1.4	36	2.1