condition mean min max ZT0-3 0.7908315 0.6380245 1.0844185 ZT4-7 1.13452 1.13452 1.13452 ZT8-11 1.4249399999999999 1.4249399999999999 1.4249399999999999 ZT12-15 1.553895 1.423335 1.684455 ZT16-19 1.2442950000000002 1.2442950000000002 1.2442950000000002 ZT20-23 0.6871685000000001 0.6871685000000001 0.6871685000000001