condition mean min max ZT0-3 57.754482 57.754482 57.754482 ZT4-7 69.5455865 69.5455865 69.5455865 ZT8-11 75.7514475 75.7514475 75.7514475 ZT12-15 57.915893 57.915893 57.915893 ZT16-19 59.728219499999994 59.728219499999994 59.728219499999994 ZT20-23 60.019185500000006 60.019185500000006 60.019185500000006