condition mean min max ZT0-3 13.9772125 12.93314308 15.02128192 ZT4-7 6.67460078875 6.494151853 6.8550497245 ZT8-11 13.755733219749999 7.040211912 20.471254527499998 ZT12-15 25.257834194999997 23.601985059999997 26.913683329999998 ZT16-19 27.409047335 23.803009345 31.015085325 ZT20-23 17.737366020000003 17.490317615000002 17.984414425