[Table/Fig-4]:

Univariate analysis of factors that predispose to complications after PCNL.

	Complications, if any		Total	p-value
Stone type (n=92)	Yes	No
Group 1	13	34	47	0.0037
Group 2	2	43	45
Duration of procedure (n=92)
<90 min	3	67	70	0.0001
>90 min	12	10	22
No. of punctures (n=132)
Single puncture	4	58	62	0.1076
Multiple punctures	11	59	70
Need for Ancillary procedures (n=92)
Group 1	6	41	47	0.0265
Group 2	0	45	45