condition mean min max ZT0-3 23.63035 23.63035 23.63035 ZT4-7 22.8874 22.8874 22.8874 ZT8-11 15.98675 15.98675 15.98675 ZT12-15 19.4681 19.4681 19.4681 ZT16-19 19.9097 19.9097 19.9097 ZT20-23 21.5193 21.5193 21.5193