condition mean min max ZT0-3 136.32973333333334 113.5889 163.2975 ZT4-7 68.1832 68.1832 68.1832 ZT8-11 42.59495 42.59495 42.59495 ZT12-15 86.03525 84.07935 87.99115 ZT16-19 103.52375 103.52375 103.52375 ZT20-23 167.1455 167.1455 167.1455