condition mean min max ZT0-3 857.95 857.95 857.95 ZT4-7 1011.5 1011.5 1011.5 ZT8-11 1197.6 1197.6 1197.6 ZT12-15 1123.45 1123.45 1123.45 ZT16-19 1100.9499999999998 1100.9499999999998 1100.9499999999998 ZT20-23 951.5 951.5 951.5