condition mean min max ZT0-3 4.254255 4.254255 4.254255 ZT4-7 2.4970299999999996 2.4970299999999996 2.4970299999999996 ZT8-11 0.9158394999999999 0.9158394999999999 0.9158394999999999 ZT12-15 1.71615 1.71615 1.71615 ZT16-19 7.0774349999999995 7.0774349999999995 7.0774349999999995 ZT20-23 5.058045 5.058045 5.058045