Table 1.

Population-based studies reporting increased periodontal disease prevalence associated with increasing age

Study	Population/region studied	Sample size	Year	Periodontal disease prevalence by age
NHANES [7]	USA	7066	2009–2012	Severe diagnosis Age: 30–34: 2.2% Age: 65 + years: 11%
NHANES [9]	USA	9689	1988–1994	Severe diagnosis Age: 30–34: 1.4% Age: 50–54: 4.6% Age: 75–79: 3.3% Moderate diagnosis Age: 30–34: 3.8% Age: 50–54: 10.6% Age: 75–79: 19.9% Mild diagnosis Age: 30–34: 17.0% Age: 50–54: 23.6% Age: 75–79: 29.5% No periodontal disease Age: 30–34: 77.8% Age: 50–54: 61.1% Age: 75–79: 47.3%
SHIP-Trend [8]	Germany	4420	2008–2012	Mean CAL Age: 30–34: 1.32 mm Age: 75 + : 2.32 mm Mean No. Missing teeth Age: 30–34: 1.3 Age: 75 + years: 9.3
Nippon Dental University [11]	Japan	582	2010–2013	Severe diagnosis Age: 20–34: 1.0% Age: 45–54: 16.4% Age: 65–74: 48.0% Moderate diagnosis Age: 20–34: 21.9% Age: 45–54: 21.3% Age: 65–74: 20.3% Mild diagnosis Age: 20–34: 28.1% Age: 45–54: 41.0% Age: 65–74: 17.5% No periodontal disease Age: 20–34: 50.0% Age: 45–54: 21.3% Age: 65–74: 14.1%
Gian Sagar Dental College and Hospital [10]	India	1680	2014	Severe diagnosis Age: 20–29: 4.3% Age: 61 + : 45.6% No periodontal disease Age: 20–29: 13.3% Age: 61 + : 1.3%

NHANES National Health and Nutrition Examination Survey, SHIP-Trend study of health in Pomerania, CAL clinical attachment loss (clinical measure used to determine disease severity)