condition mean min max ZT0-3 166.14999999999998 166.14999999999998 166.14999999999998 ZT4-7 425.7 425.7 425.7 ZT8-11 345.9 345.9 345.9 ZT12-15 330.0 330.0 330.0 ZT16-19 254.3 254.3 254.3 ZT20-23 191.65 191.65 191.65