condition mean min max ZT0-3 163.785131 163.785131 163.785131 ZT4-7 137.65405950000002 137.65405950000002 137.65405950000002 ZT8-11 112.4982865 112.4982865 112.4982865 ZT12-15 140.46459 140.46459 140.46459 ZT16-19 116.05219650000001 116.05219650000001 116.05219650000001 ZT20-23 128.813064 128.813064 128.813064