condition mean min max ZT0-3 71.299727 71.299727 71.299727 ZT4-7 46.1907485 46.1907485 46.1907485 ZT8-11 52.81634 52.81634 52.81634 ZT12-15 69.207329 69.207329 69.207329 ZT16-19 166.57343550000002 166.57343550000002 166.57343550000002 ZT20-23 276.603246 276.603246 276.603246