condition mean min max ZT0-3 68.685177 68.685177 68.685177 ZT4-7 103.4851745 103.4851745 103.4851745 ZT8-11 120.242708 120.242708 120.242708 ZT12-15 144.7172275 144.7172275 144.7172275 ZT16-19 98.4058725 98.4058725 98.4058725 ZT20-23 82.8083215 82.8083215 82.8083215