Table 4.

Incidence of VVR

		Grade I	Grade II	Grade III	Total
1W-G	n=30	3.3%	0.8%	0%	4.2%
	(number of times)	(4/120)	(1/120)	(0/120)	(5/120)
2W-G	n=31	10.5%	0.048	0%	15.3%
	(number of times)	(13/124)	(6/124)	(0/124)	(19/124)
		** p<0.001	** p<0.001		** p<0.001