condition mean min max ZT0-3 15.985524999999999 14.9977 16.97335 ZT4-7 14.4972 14.4972 14.4972 ZT8-11 8.10676 8.10676 8.10676 ZT12-15 0 0 0 ZT16-19 11.220725000000002 11.220725000000002 11.220725000000002 ZT20-23 17.0856 17.0856 17.0856