condition mean min max ZT0-3 13.72495 12.237649999999999 15.212250000000001 ZT4-7 9.77299 9.77299 9.77299 ZT8-11 9.6084 9.6084 9.6084 ZT12-15 0 0 0 ZT16-19 13.277249999999999 13.277249999999999 13.277249999999999 ZT20-23 12.312750000000001 12.312750000000001 12.312750000000001