condition mean min max ZT0-3 10.3386475 8.020495 12.6568 ZT4-7 71.15605 71.15605 71.15605 ZT8-11 449.0555 449.0555 449.0555 ZT12-15 0 0 0 ZT16-19 53.44695 53.44695 53.44695 ZT20-23 54.75065 54.75065 54.75065