condition mean min max ZT0-3 1.818595 1.818595 1.818595 ZT4-7 1.1287515 1.1287515 1.1287515 ZT8-11 1.0326300000000002 1.0326300000000002 1.0326300000000002 ZT12-15 1.16957 1.16957 1.16957 ZT16-19 1.52399 1.52399 1.52399 ZT20-23 2.324455 2.324455 2.324455