condition mean min max ZT0-3 1.40047809 1.17036103 1.63059515 ZT4-7 0.09729666875 0.0 0.1945933375 ZT8-11 28.31980626 3.3352397245 53.3043727955 ZT12-15 73.3866672275 67.240004955 79.53332950000001 ZT16-19 34.37003729875 25.1624045175 43.57767008 ZT20-23 7.45940528 3.584063727 11.334746833