condition mean min max ZT0-3 73.200287 73.200287 73.200287 ZT4-7 113.394891 113.394891 113.394891 ZT8-11 122.063036 122.063036 122.063036 ZT12-15 94.5222285 94.5222285 94.5222285 ZT16-19 92.822248 92.822248 92.822248 ZT20-23 78.31993399999999 78.31993399999999 78.31993399999999