In a logistical regression analysis there proved to be no links between gender or type of operation. When patients were grouped according to age there was a significant 2.3 times higher risk of operation-requiring postoperative bleeding in patients above 35 than for patients under 35 years. Age dependence was greater for the à chaud group alone. Here, a significant age dependence (p = 0.047) was found, as patients above the age of 40 years were estimated to have a 2.5 times higher risk of operation-requiring postoperative bleeding (2/28) than patients under 40 (9/246).