condition mean min max ZT0-3 32.7352 32.332300000000004 33.138099999999994 ZT4-7 25.720599999999997 25.720599999999997 25.720599999999997 ZT8-11 25.28255 25.28255 25.28255 ZT12-15 0 0 0 ZT16-19 30.6129 30.6129 30.6129 ZT20-23 30.6419 30.6419 30.6419