condition mean min max ZT0-3 56.88205 56.88205 56.88205 ZT4-7 55.047349999999994 55.047349999999994 55.047349999999994 ZT8-11 43.35125 43.35125 43.35125 ZT12-15 46.45385 46.45385 46.45385 ZT16-19 53.231700000000004 53.231700000000004 53.231700000000004 ZT20-23 51.1614 51.1614 51.1614