condition mean min max ZT0-3 2.2322175 2.21883 2.245605 ZT4-7 2.257015 2.257015 2.257015 ZT8-11 1.7027685 1.7027685 1.7027685 ZT12-15 0 0 0 ZT16-19 2.102335 2.102335 2.102335 ZT20-23 3.486085 3.486085 3.486085