condition mean min max ZT0-3 5.810475 3.73681 7.88414 ZT4-7 9.9558 9.9558 9.9558 ZT8-11 11.1404 11.1404 11.1404 ZT12-15 0 0 0 ZT16-19 9.45203 9.45203 9.45203 ZT20-23 6.06482 6.06482 6.06482