condition mean min max ZT0-3 10.92502 10.92502 10.92502 ZT4-7 11.528699 11.528699 11.528699 ZT8-11 11.5863865 11.5863865 11.5863865 ZT12-15 12.38293 12.38293 12.38293 ZT16-19 12.220688500000001 12.220688500000001 12.220688500000001 ZT20-23 12.4609875 12.4609875 12.4609875