condition mean min max ZT0-3 153.965189 153.965189 153.965189 ZT4-7 75.01762099999999 75.01762099999999 75.01762099999999 ZT8-11 65.8207755 65.8207755 65.8207755 ZT12-15 47.698466499999995 47.698466499999995 47.698466499999995 ZT16-19 40.020221500000005 40.020221500000005 40.020221500000005 ZT20-23 47.36144 47.36144 47.36144