condition mean min max ZT0-3 0.4353201666666667 0.35392250000000003 0.5375855 ZT4-7 0.3370275 0.3370275 0.3370275 ZT8-11 2.070755 2.070755 2.070755 ZT12-15 4.4486375 3.597965 5.29931 ZT16-19 2.104905 2.104905 2.104905 ZT20-23 1.1876235 1.1876235 1.1876235