condition mean min max ZT0-3 15.1370875 14.74615 15.528025 ZT4-7 24.78135 24.78135 24.78135 ZT8-11 45.34935 45.34935 45.34935 ZT12-15 0 0 0 ZT16-19 42.32825 42.32825 42.32825 ZT20-23 19.13855 19.13855 19.13855