condition mean min max ZT0-3 1335.6 1335.6 1335.6 ZT4-7 1596.8 1596.8 1596.8 ZT8-11 1526.25 1526.25 1526.25 ZT12-15 1446.8 1446.8 1446.8 ZT16-19 1345.1999999999998 1345.1999999999998 1345.1999999999998 ZT20-23 1362.0 1362.0 1362.0