condition mean min max ZT0-3 3.54503 3.437525 3.6525350000000003 ZT4-7 2.4882999999999997 2.4882999999999997 2.4882999999999997 ZT8-11 2.8472350000000004 2.8472350000000004 2.8472350000000004 ZT12-15 0 0 0 ZT16-19 2.98665 2.98665 2.98665 ZT20-23 2.564265 2.564265 2.564265