The invention relates to a cooking oven, having a cavity which is closable by a door. In the method for the antimicrobial treatment of a fiber and the process for the production of an antimicrobial fiber, the noble metal constituting the noble metal ion or the noble metal complex is at least one noble metal selected from the group consisting of gold, silver, platinum, palladium, ruthenium, rhodium, iridium and rhenium. A contraction inhibiting member that requires shearing off of the member for contraction may be disposed on one of the components. The clinical data are determined to have undergone a statistically significant change, compared to a baseline value BV of the data, when the calculated Z-value for the measured data is greater than or substantially equal to the pre-selected Z-value.