condition mean min max ZT0-3 19332.6 19332.6 19332.6 ZT4-7 15555.7 15555.7 15555.7 ZT8-11 15868.25 15868.25 15868.25 ZT12-15 14331.45 14331.45 14331.45 ZT16-19 18508.35 18508.35 18508.35 ZT20-23 19288.5 19288.5 19288.5