condition mean min max ZT0-3 10.365148 10.365148 10.365148 ZT4-7 10.001963499999999 10.001963499999999 10.001963499999999 ZT8-11 9.8656515 9.8656515 9.8656515 ZT12-15 8.614759 8.614759 8.614759 ZT16-19 9.6758655 9.6758655 9.6758655 ZT20-23 9.634675 9.634675 9.634675