condition mean min max ZT0-3 0.9761865 0.706534 1.474605 ZT4-7 0.9638125 0.9638125 0.9638125 ZT8-11 0.3061185 0.3061185 0.3061185 ZT12-15 0.928148 0.484829 1.371467 ZT16-19 1.521385 1.521385 1.521385 ZT20-23 0.327769 0.327769 0.327769