condition mean min max ZT0-3 23.42375 23.42375 23.42375 ZT4-7 12.47485 12.47485 12.47485 ZT8-11 13.193999999999999 13.193999999999999 13.193999999999999 ZT12-15 18.04305 18.04305 18.04305 ZT16-19 24.50675 24.50675 24.50675 ZT20-23 27.07535 27.07535 27.07535