condition mean min max ZT0-3 10.17426 9.825785 10.522735 ZT4-7 2.9311300000000005 2.9311300000000005 2.9311300000000005 ZT8-11 2.609085 2.609085 2.609085 ZT12-15 0 0 0 ZT16-19 7.404395 7.404395 7.404395 ZT20-23 7.7713 7.7713 7.7713