condition mean min max ZT0-3 17.764129419999996 17.557996879999997 17.97026196 ZT4-7 14.6146719175 13.51316377 15.716180065 ZT8-11 20.39273259 18.400446375 22.385018805 ZT12-15 28.130069102500002 25.241056790000002 31.019081415 ZT16-19 53.3205797225 43.56671642 63.074443025 ZT20-23 70.5316734925 68.05400624500001 73.00934074