condition mean min max ZT0-3 3.9716125 3.927915 4.01531 ZT4-7 2.935275 2.935275 2.935275 ZT8-11 3.03544 3.03544 3.03544 ZT12-15 0 0 0 ZT16-19 3.83254 3.83254 3.83254 ZT20-23 3.70376 3.70376 3.70376