condition mean min max ZT0-3 6.248155000000001 6.248155000000001 6.248155000000001 ZT4-7 5.49977 5.49977 5.49977 ZT8-11 5.9862 5.9862 5.9862 ZT12-15 9.170480000000001 9.170480000000001 9.170480000000001 ZT16-19 11.02735 11.02735 11.02735 ZT20-23 8.266545 8.266545 8.266545