condition mean min max ZT0-3 17.33785 17.33785 17.33785 ZT4-7 15.483699999999999 15.483699999999999 15.483699999999999 ZT8-11 11.764 11.764 11.764 ZT12-15 11.89695 11.89695 11.89695 ZT16-19 14.27505 14.27505 14.27505 ZT20-23 15.58765 15.58765 15.58765