condition mean min max ZT0-3 12.122628333333335 9.428035000000001 13.577200000000001 ZT4-7 13.80795 13.80795 13.80795 ZT8-11 12.4429 12.4429 12.4429 ZT12-15 17.965125 16.46 19.47025 ZT16-19 12.95195 12.95195 12.95195 ZT20-23 15.85295 15.85295 15.85295