condition mean min max ZT0-3 21.649299999999997 21.649299999999997 21.649299999999997 ZT4-7 20.16365 20.16365 20.16365 ZT8-11 15.901800000000001 15.901800000000001 15.901800000000001 ZT12-15 16.25625 16.25625 16.25625 ZT16-19 20.0922 20.0922 20.0922 ZT20-23 20.075400000000002 20.075400000000002 20.075400000000002