condition mean min max ZT0-3 1444.0500000000002 1444.0500000000002 1444.0500000000002 ZT4-7 1095.3 1095.3 1095.3 ZT8-11 1102.05 1102.05 1102.05 ZT12-15 1289.1999999999998 1289.1999999999998 1289.1999999999998 ZT16-19 1489.9499999999998 1489.9499999999998 1489.9499999999998 ZT20-23 1418.8000000000002 1418.8000000000002 1418.8000000000002