condition mean min max ZT0-3 17.1 17.1 17.1 ZT4-7 21.8 21.8 21.8 ZT8-11 14.65 14.65 14.65 ZT12-15 6.05 6.05 6.05 ZT16-19 30.2 30.2 30.2 ZT20-23 26.400000000000002 26.400000000000002 26.400000000000002