condition mean min max ZT0-3 12.787975 11.50205 14.0739 ZT4-7 12.77562 12.77562 12.77562 ZT8-11 77.9521 77.9521 77.9521 ZT12-15 0 0 0 ZT16-19 10.6568 10.6568 10.6568 ZT20-23 15.729 15.729 15.729