Table 1 : Quartiles of clinical and radiographic periodontal status.


Periodontalstatus Lower quartile (q1) Between lower and upper quartiles (q2) Upper quartile
(q3)

Number of pockets with depth  ≥ 4 mm 0 > 0 - < 3 > 3
Mean depth of pockets ≥ 4 mm 0 mm > 0 - < 4.5 mm > 4.5 mm
Total mmof pocket depth ≥ 4 mm 0 mm > 0 - < 15 mm > 15 mm
Marginal alveolar bone loss < 2 mm > 2 - < 3.4 mm > 3.4 mm

Friman et al.Cardiovascular System  2013 1:5DOI : 10.7243/2052-4358-1-5