condition mean min max ZT0-3 3.67108 3.67108 3.67108 ZT4-7 2.242975 2.242975 2.242975 ZT8-11 2.145055 2.145055 2.145055 ZT12-15 3.17781 3.17781 3.17781 ZT16-19 6.1909600000000005 6.1909600000000005 6.1909600000000005 ZT20-23 5.848535 5.848535 5.848535