condition mean min max ZT0-3 58.05 58.05 58.05 ZT4-7 47.9 47.9 47.9 ZT8-11 70.30000000000001 70.30000000000001 70.30000000000001 ZT12-15 71.44999999999999 71.44999999999999 71.44999999999999 ZT16-19 68.44999999999999 68.44999999999999 68.44999999999999 ZT20-23 58.25 58.25 58.25