condition mean min max ZT0-3 20.07954887 17.96471432 22.19438342 ZT4-7 8.268116715000001 7.7076750370000005 8.828558393000002 ZT8-11 13.468652629250002 10.4706193535 16.466685905000002 ZT12-15 22.04966822 16.576530565 27.522805875 ZT16-19 22.6852184675 22.224991324999998 23.14544561 ZT20-23 24.8832625275 24.4091422 25.357382855