condition mean min max ZT0-3 5.6028225 4.884285 6.32136 ZT4-7 4.9071549999999995 4.9071549999999995 4.9071549999999995 ZT8-11 6.855085 6.855085 6.855085 ZT12-15 0 0 0 ZT16-19 14.0999 14.0999 14.0999 ZT20-23 8.548605 8.548605 8.548605