condition mean min max ZT0-3 9.7284975 9.105205 10.35179 ZT4-7 24.44095 24.44095 24.44095 ZT8-11 17.07505 17.07505 17.07505 ZT12-15 0 0 0 ZT16-19 17.0855 17.0855 17.0855 ZT20-23 15.23395 15.23395 15.23395