Bed sores were the most common event for 2011, followed by surgery on the wrong part of the body and foreign objects left in bodies after surgery.
The 41 patients with bed sores was the highest number since 2005, when the reports began. But 2011's 17 patients with foreign objects left behind following surgery were the fewest ever.
Doctors performed surgery on the wrong part of the patient in 18 cases.
Nearly a third of the state's hospitals reported at least one error.