condition mean min max ZT0-3 677.3 677.3 677.3 ZT4-7 1119.7 1119.7 1119.7 ZT8-11 1025.9 1025.9 1025.9 ZT12-15 1081.6 1081.6 1081.6 ZT16-19 849.95 849.95 849.95 ZT20-23 776.95 776.95 776.95