condition mean min max ZT0-3 1.1180325 0.8546499999999999 1.381415 ZT4-7 1.244477 1.244477 1.244477 ZT8-11 0.9522575 0.9522575 0.9522575 ZT12-15 0 0 0 ZT16-19 2.1673400000000003 2.1673400000000003 2.1673400000000003 ZT20-23 1.165945 1.165945 1.165945