condition mean min max ZT0-3 57.0 57.0 57.0 ZT4-7 28.6 28.6 28.6 ZT8-11 25.65 25.65 25.65 ZT12-15 33.599999999999994 33.599999999999994 33.599999999999994 ZT16-19 38.2 38.2 38.2 ZT20-23 51.65 51.65 51.65