condition mean min max ZT0-3 4.714785 4.637905 4.791665 ZT4-7 3.2676600000000002 3.2676600000000002 3.2676600000000002 ZT8-11 3.805795 3.805795 3.805795 ZT12-15 0 0 0 ZT16-19 3.62669 3.62669 3.62669 ZT20-23 4.62455 4.62455 4.62455