condition mean min max ZT0-3 0.35123175 0.2618285 0.440635 ZT4-7 0.3471815 0.3471815 0.3471815 ZT8-11 0.1741895 0.1741895 0.1741895 ZT12-15 0 0 0 ZT16-19 0.0864595 0.0864595 0.0864595 ZT20-23 0.17413299999999998 0.17413299999999998 0.17413299999999998