condition mean min max ZT0-3 0.02704885 0.01575985 0.0484509 ZT4-7 0.0616835 0.0616835 0.0616835 ZT8-11 0.01618525 0.01618525 0.01618525 ZT12-15 0.017783475 0.0176092 0.01795775 ZT16-19 0.09186615000000001 0.09186615000000001 0.09186615000000001 ZT20-23 0.070779 0.070779 0.070779