condition mean min max ZT0-3 6753.7 6753.7 6753.7 ZT4-7 5750.1 5750.1 5750.1 ZT8-11 5971.1 5971.1 5971.1 ZT12-15 5066.5 5066.5 5066.5 ZT16-19 6157.7 6157.7 6157.7 ZT20-23 7098.45 7098.45 7098.45