condition mean min max ZT0-3 53.462525 52.872749999999996 54.0523 ZT4-7 25.66185 25.66185 25.66185 ZT8-11 7.007855 7.007855 7.007855 ZT12-15 0 0 0 ZT16-19 13.3765 13.3765 13.3765 ZT20-23 47.03805 47.03805 47.03805