Table 1. Demographic characteristics of the patients with primary biliary cirrhosis.

			both sexes	males	females
No. of patients			5,805	646	5,159
Age (year)	mean ±standard deviation		59±10.7	60±11.8	59±10.5
	median		60	62	59
	relative frequency (%)
		<19 years	0.1	0.6	0.1
		20-29	0.6	0.6	0.6
		30-39	2.8	3.3	2.8
		40-49	15.8	13.8	16.1
		50-59	30.4	24.1	31.1
		60-69	34.1	35.1	34.0
		70-79	14.3	19.7	13.7
		80+	1.7	2.8	1.6
		total	100	100	100