condition mean min max ZT0-3 9.447385 9.447385 9.447385 ZT4-7 10.033816 10.033816 10.033816 ZT8-11 9.4414385 9.4414385 9.4414385 ZT12-15 9.613452 9.613452 9.613452 ZT16-19 8.7678135 8.7678135 8.7678135 ZT20-23 9.009164 9.009164 9.009164