condition mean min max ZT0-3 291.5 291.5 291.5 ZT4-7 63.3 63.3 63.3 ZT8-11 277.9 277.9 277.9 ZT12-15 719.75 719.75 719.75 ZT16-19 547.9499999999999 547.9499999999999 547.9499999999999 ZT20-23 87.25 87.25 87.25