condition mean min max ZT0-3 537.4241852 516.5555111000001 558.2928593 ZT4-7 415.3860567 354.0907445 476.68136889999994 ZT8-11 282.135746175 232.92165715 331.34983520000003 ZT12-15 44.2465353975 22.754558735 65.73851205999999 ZT16-19 104.6544479475 59.99484741 149.314048485 ZT20-23 292.259401975 246.7627715 337.75603245