condition mean min max ZT0-3 2149.6 2149.6 2149.6 ZT4-7 3303.7 3303.7 3303.7 ZT8-11 1974.6499999999999 1974.6499999999999 1974.6499999999999 ZT12-15 1960.3 1960.3 1960.3 ZT16-19 2014.4 2014.4 2014.4 ZT20-23 1695.55 1695.55 1695.55