condition mean min max ZT0-3 50.400000000000006 50.400000000000006 50.400000000000006 ZT4-7 87.1 87.1 87.1 ZT8-11 138.45 138.45 138.45 ZT12-15 175.2 175.2 175.2 ZT16-19 129.65 129.65 129.65 ZT20-23 131.9 131.9 131.9