condition mean min max ZT0-3 7.6178175 6.6348 8.600835 ZT4-7 10.6817 10.6817 10.6817 ZT8-11 7.66664 7.66664 7.66664 ZT12-15 0 0 0 ZT16-19 12.85275 12.85275 12.85275 ZT20-23 19.66555 19.66555 19.66555