More patients in the zoledronic acid group had renal toxic effects than in the ibandronic acid group ( @ -LSB- @ % -RSB- of @ vs @ -LSB- @ % -RSB- of @ ) but rates of osteonecrosis of the jaw were low in both groups ( nine -LSB- @ % -RSB- of @ vs five -LSB- < @ % -RSB- of @ ) .