condition mean min max ZT0-3 41.85 41.85 41.85 ZT4-7 182.1 182.1 182.1 ZT8-11 157.35 157.35 157.35 ZT12-15 159.9 159.9 159.9 ZT16-19 39.400000000000006 39.400000000000006 39.400000000000006 ZT20-23 88.65 88.65 88.65