condition mean min max ZT0-3 12.407398333333335 4.990945 16.704700000000003 ZT4-7 5.316135 5.316135 5.316135 ZT8-11 5.133145 5.133145 5.133145 ZT12-15 10.930019999999999 8.16479 13.69525 ZT16-19 13.6308 13.6308 13.6308 ZT20-23 18.03455 18.03455 18.03455