condition mean min max ZT0-3 11.7521 11.7521 11.7521 ZT4-7 10.208205 10.208205 10.208205 ZT8-11 9.89704 9.89704 9.89704 ZT12-15 10.9916 10.9916 10.9916 ZT16-19 13.3177 13.3177 13.3177 ZT20-23 11.8719 11.8719 11.8719