condition mean min max ZT0-3 17.646058333333336 16.258666666666667 19.033450000000002 ZT4-7 15.8657 15.8657 15.8657 ZT8-11 18.4128 18.4128 18.4128 ZT12-15 24.485075000000002 23.298650000000002 25.671499999999998 ZT16-19 22.0255 20.532899999999998 23.5181 ZT20-23 0 0 0