condition mean min max ZT0-3 4.77440881725 1.646660126 7.9021575085 ZT4-7 16.9840770275 13.99482961 19.973324445000003 ZT8-11 13.24074625375 10.0406437625 16.440848745 ZT12-15 3.7133473529999996 3.6776059899999995 3.7490887159999997 ZT16-19 2.9873509984999997 2.590795256 3.3839067409999997 ZT20-23 2.4917417887499997 1.9517729 3.0317106775