condition mean min max ZT0-3 123.7808569 102.6504584 144.91125540000002 ZT4-7 158.3301956 147.10287745 169.55751375 ZT8-11 150.657281725 149.90575485 151.4088086 ZT12-15 75.65621626 49.632464535 101.67996798499999 ZT16-19 60.668987560000005 60.5441888 60.79378632000001 ZT20-23 47.365363397500005 44.209939805000005 50.520786990000005