Split-dose or hybrid nonsteroidal anti-inflammatory drugs and N-acetylcysteine therapy for prevention of post-retrograde cholangiopancreatography pancreatitis

Table 2 Pearson’s chi-squared test to compare risk factors’ occurrence in the three study arms

PEP	Pearson’s chi-square	df	P
Existent risk factors	0.627	2	0.731, NS
Female sex	5.651	2	0.059, NS
Young age	3.030	2	0.220, NS
Normal bilirubin	5.446	2	0.066, NS
Excess contrast agent	2.409	2	0.300, NS
No. of cannulations	0.645	2	0.724, NS
PEP	1.835	2	0.399, NS

NS: Non-significant; PEP: Post-endoscopic retrograde cholangiopancreatography pancreatitis.