condition mean min max ZT0-3 1505.1999999999998 1505.1999999999998 1505.1999999999998 ZT4-7 1333.2 1333.2 1333.2 ZT8-11 1178.15 1178.15 1178.15 ZT12-15 1210.75 1210.75 1210.75 ZT16-19 1521.25 1521.25 1521.25 ZT20-23 1595.75 1595.75 1595.75