condition mean min max ZT0-3 59.7 59.7 59.7 ZT4-7 66.5 66.5 66.5 ZT8-11 81.19999999999999 81.19999999999999 81.19999999999999 ZT12-15 60.400000000000006 60.400000000000006 60.400000000000006 ZT16-19 63.650000000000006 63.650000000000006 63.650000000000006 ZT20-23 91.4 91.4 91.4