condition mean min max ZT0-3 68.15 68.15 68.15 ZT4-7 86.9 86.9 86.9 ZT8-11 69.6 69.6 69.6 ZT12-15 54.75 54.75 54.75 ZT16-19 63.400000000000006 63.400000000000006 63.400000000000006 ZT20-23 55.65 55.65 55.65