condition mean min max ZT0-3 44.80631783 18.40639748 71.20623818 ZT4-7 156.76979425 121.02378879999999 192.5157997 ZT8-11 170.803034525 153.6233797 187.98268935000002 ZT12-15 35.755604035 12.807064365 58.704143705 ZT16-19 19.649438947500002 16.928086355 22.37079154 ZT20-23 21.8436613075 21.492542049999997 22.194780565000002