Perth’s three big adult public hospitals had more than 11,000 code blacks last year — the equivalent of 30 reports of aggression a day. Royal Perth Hospital had the highest number, with 4002 personal threat alarms, while Fiona Stanley and Sir Charles Gairdner hospitals had 3479 and 3587 cases respectively. The State’s specialist maternity hospital, King Edward Memorial, had five code blacks a week in 2017. Code blacks are incidents of actual or potential aggression that could cause harm to staff, patients or visitors.