condition mean min max ZT0-3 14.833775000000001 13.1375 16.530050000000003 ZT4-7 50.2843 50.2843 50.2843 ZT8-11 50.1683 50.1683 50.1683 ZT12-15 0 0 0 ZT16-19 19.15665 19.15665 19.15665 ZT20-23 21.63745 21.63745 21.63745