condition mean min max ZT0-3 50.98501666666667 38.2505 72.64185 ZT4-7 66.2275 66.2275 66.2275 ZT8-11 34.5382 34.5382 34.5382 ZT12-15 46.162125 45.5717 46.75255 ZT16-19 33.78245 33.78245 33.78245 ZT20-23 31.7829 31.7829 31.7829