condition mean min max ZT0-3 29.55 29.55 29.55 ZT4-7 22.0 22.0 22.0 ZT8-11 58.25 58.25 58.25 ZT12-15 41.8 41.8 41.8 ZT16-19 7.05 7.05 7.05 ZT20-23 20.599999999999998 20.599999999999998 20.599999999999998