condition mean min max ZT0-3 42.266789 42.266789 42.266789 ZT4-7 12.8033355 12.8033355 12.8033355 ZT8-11 16.4267695 16.4267695 16.4267695 ZT12-15 25.965491 25.965491 25.965491 ZT16-19 37.2574925 37.2574925 37.2574925 ZT20-23 127.383522 127.383522 127.383522