condition mean min max ZT0-3 3.12244 3.12244 3.12244 ZT4-7 1.2626149999999998 1.2626149999999998 1.2626149999999998 ZT8-11 2.449915 2.449915 2.449915 ZT12-15 3.17361 3.17361 3.17361 ZT16-19 8.39627 8.39627 8.39627 ZT20-23 4.57074 4.57074 4.57074