condition mean min max ZT0-3 1.4923855 1.034254 1.89866 ZT4-7 0.680261 0.680261 0.680261 ZT8-11 0.8593575 0.8593575 0.8593575 ZT12-15 0.920058 0.5301615000000001 1.3099545 ZT16-19 0.4930875 0.4930875 0.4930875 ZT20-23 1.1056300000000001 1.1056300000000001 1.1056300000000001