condition mean min max ZT0-3 89.7 89.7 89.7 ZT4-7 78.9 78.9 78.9 ZT8-11 65.19999999999999 65.19999999999999 65.19999999999999 ZT12-15 48.7 48.7 48.7 ZT16-19 53.95 53.95 53.95 ZT20-23 64.35 64.35 64.35