Table 1

Baseline demographic and clinical characteristics of subjects

Characteristics	No (n=394 026)	%
Gender
Female	242 115	61.4
Male	151 866	38.6
Missing data (n=45)
Age group (years)
40–44	49 281	12.9
45–49	71 564	18.7
50–54	78 428	20.5
55–59	69 530	18.2
≥60 years	114 305	29.8
Mean±SD	54.92±9.03
Median (minimum:maximum)	54 (40:100)
Missing data (n=10 918)
Education levels
None	6561	1.7
Primary	286 840	72.9
Secondary	78 090	19.9
Certificate/bachelor	18 632	4.7
Higher than bachelor	3055	0.8
Missing data (n=848)
Occupation
Unemployed	15 582	4.0
Farmer	306 421	77.9
Labour	32 420	8.2
Own business	13 467	3.4
Government official/state enterprises	13 997	3.6
Others	11 335	2.9
Missing data (n=804)
Relatives diagnosed with CCA
No	319 902	81.4
Yes	73 286	18.6
Missing data (n=838)
Liver fluke infection
No	113 178	62.1
Yes	68 979	37.9
Missing data (n=211 869)
Praziquantel treatment
None	270 183	70.3
One time	84 136	21.9
Two times	18 126	4.7
Three times	5264	1.4
More than three times	6414	1.7
Missing data (n=9903)
Smoking history
No	308 776	78.7
Yes, current or previous	83 754	21.3
Missing data (n=1496)
Alcohol consumption history
No	214 495	54.6
Yes, current or previous	178 564	45.4
Missing data (n=967)
Hepatitis B
No	382 058	98.2
Yes	6803	1.8
Missing data (n=5165)
Hepatitis C
No	388 114	99.8
Yes	747	0.2
Missing data (n=5165)
Diabetes mellitus
No	362 296	93.2
Yes	26 565	6.8
Missing data (n=5165)
Periductal fibrosis
None	324 482	82.4
PDF1	48 383	12.3
PDF2	18 686	4.7
PDF3	2475	0.6