condition mean min max ZT0-3 37.7 37.7 37.7 ZT4-7 37.7 37.7 37.7 ZT8-11 57.800000000000004 57.800000000000004 57.800000000000004 ZT12-15 99.45 99.45 99.45 ZT16-19 21.1 21.1 21.1 ZT20-23 47.849999999999994 47.849999999999994 47.849999999999994