condition mean min max ZT0-3 2.03698 2.03698 2.03698 ZT4-7 1.5826099999999999 1.5826099999999999 1.5826099999999999 ZT8-11 1.70861 1.70861 1.70861 ZT12-15 1.890355 1.890355 1.890355 ZT16-19 2.93856 2.93856 2.93856 ZT20-23 1.5435949999999998 1.5435949999999998 1.5435949999999998