condition mean min max ZT0-3 58.0 58.0 58.0 ZT4-7 6.6 6.6 6.6 ZT8-11 47.75 47.75 47.75 ZT12-15 19.599999999999998 19.599999999999998 19.599999999999998 ZT16-19 60.75 60.75 60.75 ZT20-23 37.65 37.65 37.65