condition mean min max ZT0-3 1.189236 1.021232 1.35724 ZT4-7 1.362235 1.362235 1.362235 ZT8-11 3.51053 3.51053 3.51053 ZT12-15 0 0 0 ZT16-19 3.24938 3.24938 3.24938 ZT20-23 2.340605 2.340605 2.340605