condition mean min max ZT0-3 1838.6 1838.6 1838.6 ZT4-7 1421.9 1421.9 1421.9 ZT8-11 1319.55 1319.55 1319.55 ZT12-15 1364.0 1364.0 1364.0 ZT16-19 1792.8 1792.8 1792.8 ZT20-23 1969.75 1969.75 1969.75