condition mean min max ZT0-3 40.9 40.9 40.9 ZT4-7 28.5 28.5 28.5 ZT8-11 48.0 48.0 48.0 ZT12-15 38.9 38.9 38.9 ZT16-19 23.400000000000002 23.400000000000002 23.400000000000002 ZT20-23 37.5 37.5 37.5