condition mean min max ZT0-3 1.5174299999999998 1.07496 1.9598999999999998 ZT4-7 1.92749 1.92749 1.92749 ZT8-11 3.261655 3.261655 3.261655 ZT12-15 0 0 0 ZT16-19 3.362045 3.362045 3.362045 ZT20-23 2.41284 2.41284 2.41284