condition mean min max ZT0-3 38.33518364 31.97948083 44.69088645 ZT4-7 39.256532414999995 38.8853911 39.62767373 ZT8-11 22.779447503999997 17.496982053 28.061912954999997 ZT12-15 5.640672202499999 4.272844585 7.00849982 ZT16-19 8.656324049 6.4116061250000005 10.901041973 ZT20-23 12.531933174999999 11.72709946 13.33676689