condition mean min max ZT0-3 979.75 979.75 979.75 ZT4-7 1234.9 1234.9 1234.9 ZT8-11 1219.15 1219.15 1219.15 ZT12-15 1125.25 1125.25 1125.25 ZT16-19 1031.05 1031.05 1031.05 ZT20-23 916.45 916.45 916.45