condition mean min max ZT0-3 137.33825000000002 137.18 137.49650000000003 ZT4-7 29.1259 29.1259 29.1259 ZT8-11 36.73465 36.73465 36.73465 ZT12-15 0 0 0 ZT16-19 127.27799999999999 127.27799999999999 127.27799999999999 ZT20-23 67.49325 67.49325 67.49325