condition mean min max ZT0-3 31.992424999999997 28.3372 35.64765 ZT4-7 19.5858 19.5858 19.5858 ZT8-11 7.9145650000000005 7.9145650000000005 7.9145650000000005 ZT12-15 0 0 0 ZT16-19 9.375265 9.375265 9.375265 ZT20-23 25.81825 25.81825 25.81825