condition mean min max ZT0-3 3.5071149999999998 3.2389799999999997 3.7752499999999998 ZT4-7 3.743535 3.743535 3.743535 ZT8-11 4.754675 4.754675 4.754675 ZT12-15 0 0 0 ZT16-19 7.00229 7.00229 7.00229 ZT20-23 4.579955 4.579955 4.579955