condition mean min max ZT0-3 17.5906 14.7857 20.3955 ZT4-7 15.347550000000002 15.347550000000002 15.347550000000002 ZT8-11 6.816459999999999 6.816459999999999 6.816459999999999 ZT12-15 0 0 0 ZT16-19 5.380585 5.380585 5.380585 ZT20-23 7.563675 7.563675 7.563675