condition mean min max ZT0-3 19.60085 19.60085 19.60085 ZT4-7 14.1404 14.1404 14.1404 ZT8-11 10.387805 10.387805 10.387805 ZT12-15 9.63602 9.63602 9.63602 ZT16-19 17.6871 17.6871 17.6871 ZT20-23 20.52345 20.52345 20.52345