condition mean min max ZT0-3 29.35725 29.35725 29.35725 ZT4-7 13.72625 13.72625 13.72625 ZT8-11 57.75685 57.75685 57.75685 ZT12-15 114.9855 114.9855 114.9855 ZT16-19 84.00165 84.00165 84.00165 ZT20-23 67.3535 67.3535 67.3535