condition mean min max ZT0-3 12.754281 12.754281 12.754281 ZT4-7 12.840128 12.840128 12.840128 ZT8-11 12.8701875 12.8701875 12.8701875 ZT12-15 12.537551 12.537551 12.537551 ZT16-19 12.096021 12.096021 12.096021 ZT20-23 11.908136500000001 11.908136500000001 11.908136500000001