condition mean min max ZT0-3 63.550000000000004 63.550000000000004 63.550000000000004 ZT4-7 88.5 88.5 88.5 ZT8-11 48.95 48.95 48.95 ZT12-15 54.95 54.95 54.95 ZT16-19 83.15 83.15 83.15 ZT20-23 36.0 36.0 36.0