condition mean min max ZT0-3 14.657399999999999 14.657399999999999 14.657399999999999 ZT4-7 11.794550000000001 11.794550000000001 11.794550000000001 ZT8-11 10.012799999999999 10.012799999999999 10.012799999999999 ZT12-15 10.88635 10.88635 10.88635 ZT16-19 15.7735 15.7735 15.7735 ZT20-23 15.8696 15.8696 15.8696