condition mean min max ZT0-3 6865.05 6865.05 6865.05 ZT4-7 4887.6 4887.6 4887.6 ZT8-11 5846.1 5846.1 5846.1 ZT12-15 6379.4 6379.4 6379.4 ZT16-19 7860.25 7860.25 7860.25 ZT20-23 8031.2 8031.2 8031.2