Table 2. Prevalence studies of supernumerary teeth based on observations of skulls.

Year	Author	Country	Material	Sample size (n)	Prevalencex (%)
Visual examination
1925	Campbell39	Australia	Australian aborigines	600	1.5
1925	Leigh40	USA	American Indian tribes
			Sioux	92	1.1
			Arikar	129	3.1
			Havikuh Zuni	113	1.8
		USA	American Inuit	325	2.2
1937	Leigh41	USA	Pre-Spanish Peruvians	900	0.6
1938	Nelsen42		Pecos Pueblo Indians	172	0.6
1939	Pedersen and Hinch32	Denmark	East Greenland Inuit	513	1.1
1943	Rabkin43	USA	American Indian (Indian Knoll, prehistoric)	300	0
1948	Goldstein44	USA	American Indian	177	2.2
1950	Sinclair et al45	Papua New Guinea	New Guinea	209	0.9
1953	Reed46	USA	Am Te'ewi Indians	40	5.0
1956	Klatsky47	USA	Mix	8328	0.5
1956	Davies48	New Zealand	Pukapuka	472	2.1
1960	Snyder7	USA	American Indian (Point of Pines)	350
1964	Pal49	India	Indian	347	2.0
1968	De Villers50	South Africa	Black	650	1.8
Visual and radiographic examination
1984	Hurlen and Humerfelt51	Norway	Oslo medieval	942	1.7
			Lapp	439	1.4
1989	Stermer Beyer-Oslen52	Norway	Trondheim	140	1.4
1999	Rao53	Zimbabwe	Zimbabwean black	153	1.3
2009	Van der Merwe and Steyn54	South Africa	Gladstone	89	6.7