Table 2. Researches on etiologies of CP patients in different countries.

Countries	Inclusion period	ACP	ICP	Other etiologies
Danish [33]	1995–2010	6306 (52.7%)	-	5666 (47.3%)*
Japan [36]	2011	1171 (67.5%)	347 (20.0%)	216 (12.5)
China [11]	1994–2004	705 (35.1%)	259 (12.9%)	1044 (52.0%)
The United States [34]	2000–2014	575 (49.1%)	286 (24.4%)	310 (26.5%)
India [39]	-2007	400 (38.7%)	622 (60.2%)	11 (1.1%)
Brazil [35]	1963–1986	282 (85.7%)	34 (10.3%)	13 (4.0%)
Germany [13]	1989–1995	733 (72.0%)	224 (22.0%)	61 (6.0%)
Present study	2000–2013	404 (18.8%)	1633 (75.8%)	116 (5.4)

*Nonalcoholic CP

ACP = alcoholic chronic pancreatitis, CP = chronic pancreatitis, ICP = idiopathic chronic pancreatitis