condition mean min max ZT0-3 989.3000000000001 989.3000000000001 989.3000000000001 ZT4-7 948.5 948.5 948.5 ZT8-11 842.05 842.05 842.05 ZT12-15 790.55 790.55 790.55 ZT16-19 833.95 833.95 833.95 ZT20-23 812.3 812.3 812.3