condition mean min max ZT0-3 53.65 53.65 53.65 ZT4-7 32.8 32.8 32.8 ZT8-11 35.0 35.0 35.0 ZT12-15 73.65 73.65 73.65 ZT16-19 60.400000000000006 60.400000000000006 60.400000000000006 ZT20-23 70.8 70.8 70.8