condition mean min max ZT0-3 99.33872 99.33872 99.33872 ZT4-7 55.4996565 55.4996565 55.4996565 ZT8-11 47.5366375 47.5366375 47.5366375 ZT12-15 45.525318999999996 45.525318999999996 45.525318999999996 ZT16-19 45.6134305 45.6134305 45.6134305 ZT20-23 37.7243695 37.7243695 37.7243695