condition mean min max ZT0-3 21.303974999999998 21.163249999999998 21.444699999999997 ZT4-7 11.721935 11.721935 11.721935 ZT8-11 24.5539 24.5539 24.5539 ZT12-15 0 0 0 ZT16-19 45.2235 45.2235 45.2235 ZT20-23 34.8851 34.8851 34.8851