condition mean min max ZT0-3 38.00278333333333 25.39275 45.873149999999995 ZT4-7 20.6187 20.6187 20.6187 ZT8-11 66.99055 66.99055 66.99055 ZT12-15 77.00970000000001 73.00425 81.01515 ZT16-19 64.33160000000001 64.33160000000001 64.33160000000001 ZT20-23 59.997699999999995 59.997699999999995 59.997699999999995