condition mean min max ZT0-3 4.0850075 3.753545 4.41647 ZT4-7 3.414165 3.414165 3.414165 ZT8-11 6.402585 6.402585 6.402585 ZT12-15 0 0 0 ZT16-19 10.289200000000001 10.289200000000001 10.289200000000001 ZT20-23 5.655635 5.655635 5.655635