condition mean min max ZT0-3 4.9195174999999995 4.678554999999999 5.16048 ZT4-7 6.983285 6.983285 6.983285 ZT8-11 15.198 15.198 15.198 ZT12-15 0 0 0 ZT16-19 13.63675 13.63675 13.63675 ZT20-23 8.254175 8.254175 8.254175