condition mean min max ZT0-3 0.0 0.0 0.0 ZT4-7 0.0 0.0 0.0 ZT8-11 5.85705 5.85705 5.85705 ZT12-15 2.670555 2.670555 2.670555 ZT16-19 4.66839 4.66839 4.66839 ZT20-23 6.99778 6.99778 6.99778