Table 2. Exploratory Subgroup Analyses: NSAIDs Versus Placebo in Reducing the Number of Pancreatitis.

Subgroup	No. Studies	No. Patients	RR (95% CI)
Age
Young*	4	937	0.54 (0.37–0.77)
Old	4	1017	0.56 (0.38–0.83)
Sex
Female	4	1381	0.54 (0.40–0.73)
Male	4	573	0.61 (0.34–1.09)
SOD
Yes	3	698	0.98 (0.38–2.54)
No	3	806	0.44 (0.30–0.65)
Pancreatic sphincterotomy
Yes	6	1246	0.54 (0.29–0.98)
No	6	1102	0.39 (0.27–0.59)
Pancreatic duct injection
Yes	5	338	0.64 (0.35–1.18)
No	5	1766	0.54 (0.40–0.72)

^*Two different cutoff values were used to separate young and old patients (3 studies used 60 years and 1 study used 45 years).