condition mean min max ZT0-3 5.8825 5.52943 6.23557 ZT4-7 7.5198 7.5198 7.5198 ZT8-11 7.826575 7.826575 7.826575 ZT12-15 0 0 0 ZT16-19 7.68932 7.68932 7.68932 ZT20-23 8.729244999999999 8.729244999999999 8.729244999999999