condition mean min max ZT0-3 468.155134 468.155134 468.155134 ZT4-7 563.131619 563.131619 563.131619 ZT8-11 523.434518 523.434518 523.434518 ZT12-15 552.3686525 552.3686525 552.3686525 ZT16-19 509.7089635 509.7089635 509.7089635 ZT20-23 554.6226245 554.6226245 554.6226245