condition mean min max ZT0-3 0.31619200000000003 0.31619200000000003 0.31619200000000003 ZT4-7 0.34914500000000004 0.34914500000000004 0.34914500000000004 ZT8-11 0.366936 0.366936 0.366936 ZT12-15 0.19191 0.19191 0.19191 ZT16-19 0.392621 0.392621 0.392621 ZT20-23 0.4404395 0.4404395 0.4404395