condition mean min max ZT0-3 3.3437175 2.92371 3.763725 ZT4-7 2.05055 2.05055 2.05055 ZT8-11 1.29527 1.29527 1.29527 ZT12-15 0 0 0 ZT16-19 2.871585 2.871585 2.871585 ZT20-23 3.5263 3.5263 3.5263