condition mean min max ZT0-3 12.946086666666666 10.504480000000001 16.2272 ZT4-7 14.87465 14.87465 14.87465 ZT8-11 10.289145 10.289145 10.289145 ZT12-15 30.160125 30.051499999999997 30.26875 ZT16-19 18.03505 18.03505 18.03505 ZT20-23 14.788450000000001 14.788450000000001 14.788450000000001