condition mean min max ZT0-3 35.4 35.4 35.4 ZT4-7 57.2 57.2 57.2 ZT8-11 88.5 88.5 88.5 ZT12-15 41.35 41.35 41.35 ZT16-19 78.80000000000001 78.80000000000001 78.80000000000001 ZT20-23 63.25 63.25 63.25