condition mean min max ZT0-3 1547.9 1547.9 1547.9 ZT4-7 1204.8 1204.8 1204.8 ZT8-11 1623.3 1623.3 1623.3 ZT12-15 1744.65 1744.65 1744.65 ZT16-19 1647.1999999999998 1647.1999999999998 1647.1999999999998 ZT20-23 1828.75 1828.75 1828.75