condition mean min max ZT0-3 26.951483333333336 16.098300000000002 33.94825 ZT4-7 20.24335 20.24335 20.24335 ZT8-11 17.2174 17.2174 17.2174 ZT12-15 21.432699999999997 19.047 23.818399999999997 ZT16-19 24.41385 24.41385 24.41385 ZT20-23 31.4537 31.4537 31.4537