condition mean min max ZT0-3 10.543718333333334 9.54011 11.17295 ZT4-7 17.37185 17.37185 17.37185 ZT8-11 32.946600000000004 32.946600000000004 32.946600000000004 ZT12-15 49.796025 43.3585 56.233549999999994 ZT16-19 32.9413 32.9413 32.9413 ZT20-23 17.2293 17.2293 17.2293