condition mean min max ZT0-3 27.3 27.3 27.3 ZT4-7 44.9 44.9 44.9 ZT8-11 48.4 48.4 48.4 ZT12-15 40.45 40.45 40.45 ZT16-19 16.35 16.35 16.35 ZT20-23 21.400000000000002 21.400000000000002 21.400000000000002