condition mean min max ZT0-3 0.5013935 0.180836 0.920872 ZT4-7 0.612456 0.612456 0.612456 ZT8-11 3.6727550000000004 3.6727550000000004 3.6727550000000004 ZT12-15 1.9893750000000001 1.39336 2.5853900000000003 ZT16-19 1.743175 1.743175 1.743175 ZT20-23 0.8076025 0.8076025 0.8076025