condition mean min max ZT0-3 3.091234697 2.0249983819999997 4.157471012 ZT4-7 5.70232062675 5.172436956 6.2322042975 ZT8-11 5.34664373925 4.8595605235 5.8337269549999995 ZT12-15 3.455722361 3.374167077 3.5372776449999996 ZT16-19 3.7803974802499996 3.1690442785 4.391750682 ZT20-23 8.34293585475 5.944938859500001 10.74093285