. 2016 Oct 17;14(4):322–332. doi: 10.5217/ir.2016.14.4.322

Table 2. Comparison between Large and Small Centers Performing CD Operations.

Variable	Large center (sample size >50)				Small center (sample size ≤50)				P-value
Variable	Available centers	Available sample size	No. of cases	Average rate (mean±SD, %)	Available centers	Available sample size	No. of cases	Average rate (mean±SD, %)	P-value
Emergency operation	4	437	72	18.6±13.3	11	295	163	50.6±28.3	0.032^a
Surgical indications	8	976	683	66.7±31.0	28	693	469	68.1±27.6	0.903
Misdiagnosis	5	511	179	41.4±39.0	30	757	399	50.9±29.9	0.473
Postoperative complications	7	724	122	16.5±8.9	21	601	145	24.3±13.7	0.173
Reoperation within 30 days	3	306	77	21.1±2.6	13	339	30	9.0±6.3	0.006^a
In-hospital mortality	7	790	5	0.7±1.0	28	744	21	3.1±2.7	0.026^a

^aP<0.05.