RESULTS	OHSS incidence was significantly higher in the placebo group ( group 2 ) than in the calcium infusion group ( group 1 ) : 23 ( 23 % ) vs. 7 ( 7 % ) ; moderate OHSS was significantly higher in group 2 than in group 1 : 8 ( 8 % ) vs. 1 ( 1 % ) ; and severe OHSS was significantly higher in group 2 than in group 1 : 4 ( 4 % ) vs. 0 .\