condition mean min max ZT0-3 4.81179 4.68942 4.93416 ZT4-7 2.444925 2.444925 2.444925 ZT8-11 2.747095 2.747095 2.747095 ZT12-15 0 0 0 ZT16-19 3.05035 3.05035 3.05035 ZT20-23 3.4912400000000003 3.4912400000000003 3.4912400000000003