condition mean min max ZT0-3 676.7 676.7 676.7 ZT4-7 1278.1 1278.1 1278.1 ZT8-11 1109.95 1109.95 1109.95 ZT12-15 1096.4 1096.4 1096.4 ZT16-19 982.5 982.5 982.5 ZT20-23 891.6 891.6 891.6