condition mean min max ZT0-3 11.4017 11.4017 11.4017 ZT4-7 7.7368950000000005 7.7368950000000005 7.7368950000000005 ZT8-11 10.367565 10.367565 10.367565 ZT12-15 11.08545 11.08545 11.08545 ZT16-19 10.72755 10.72755 10.72755 ZT20-23 10.68827 10.68827 10.68827