condition mean min max ZT0-3 130.510446 130.510446 130.510446 ZT4-7 76.6439955 76.6439955 76.6439955 ZT8-11 83.049452 83.049452 83.049452 ZT12-15 111.124882 111.124882 111.124882 ZT16-19 131.654233 131.654233 131.654233 ZT20-23 70.96884299999999 70.96884299999999 70.96884299999999