condition mean min max ZT0-3 455.847441 455.847441 455.847441 ZT4-7 1031.8526295000001 1031.8526295000001 1031.8526295000001 ZT8-11 1453.1783865 1453.1783865 1453.1783865 ZT12-15 1148.672221 1148.672221 1148.672221 ZT16-19 1299.6061555 1299.6061555 1299.6061555 ZT20-23 1068.3972975 1068.3972975 1068.3972975