condition mean min max ZT0-3 60.862425 58.2331 63.491749999999996 ZT4-7 63.7737 63.7737 63.7737 ZT8-11 71.52265 71.52265 71.52265 ZT12-15 0 0 0 ZT16-19 72.49635 72.49635 72.49635 ZT20-23 88.44815 88.44815 88.44815