condition mean min max ZT0-3 211.693595 211.693595 211.693595 ZT4-7 220.452554 220.452554 220.452554 ZT8-11 221.94393000000002 221.94393000000002 221.94393000000002 ZT12-15 210.574388 210.574388 210.574388 ZT16-19 168.908691 168.908691 168.908691 ZT20-23 150.9919825 150.9919825 150.9919825