condition mean min max ZT0-3 237.385466 237.385466 237.385466 ZT4-7 173.12930699999998 173.12930699999998 173.12930699999998 ZT8-11 155.848573 155.848573 155.848573 ZT12-15 246.154946 246.154946 246.154946 ZT16-19 156.39181 156.39181 156.39181 ZT20-23 149.14920899999998 149.14920899999998 149.14920899999998