condition mean min max ZT0-3 89.1647 69.39675 110.7755 ZT4-7 249.3955 249.3955 249.3955 ZT8-11 231.99849999999998 231.99849999999998 231.99849999999998 ZT12-15 128.10125 119.3675 136.83499999999998 ZT16-19 153.904 153.904 153.904 ZT20-23 193.1175 193.1175 193.1175