condition mean min max ZT0-3 0.607717963 0.0 1.215435926 ZT4-7 6.6269762945 4.181928303 9.072024286000001 ZT8-11 32.8718882175 25.48289499 40.260881445 ZT12-15 54.70709721 52.88728632 56.5269081 ZT16-19 39.926333400000004 35.3199643 44.5327025 ZT20-23 29.0904987875 27.8769937 30.304003875