condition mean min max ZT0-3 2.16576 2.16576 2.16576 ZT4-7 1.708465 1.708465 1.708465 ZT8-11 1.649995 1.649995 1.649995 ZT12-15 2.08485 2.08485 2.08485 ZT16-19 2.2217000000000002 2.2217000000000002 2.2217000000000002 ZT20-23 2.10852 2.10852 2.10852