condition mean min max ZT0-3 57.90675 57.90675 57.90675 ZT4-7 36.65065 36.65065 36.65065 ZT8-11 50.50925 50.50925 50.50925 ZT12-15 212.4915 212.4915 212.4915 ZT16-19 111.66749999999999 111.66749999999999 111.66749999999999 ZT20-23 85.37135 85.37135 85.37135