| Authors | Prevalence | Number of children in the sample |
|
Magitot, 1876 [2]
| 1 : 6000 | 17,578 |
Puech, 1876 | 1 : 30000 | 60,000 |
Ballantyne, 1896 [3] | 1 : 6000 | 17,578 | Massler and Savara, 1950 [4] | 1 : 2000 | 6,000 |
Allwright, 1958 [5]
| 1 : 3408 | 6,817 |
Bodenhoff, 1959 [6]
| 1 : 3000 | — |
Wong, 1962 [7]
| 1 : 3000 | — | Bodenhoff and Gorlin, 1963 [8] | 1 : 3000 | — | Mayhall, 1967 [9] | 1 : 1125 | 90 |
Chow, 1980 [10]
| 1 : 2000 to 3500 | — |
Anderson, 1982 [11]
| 1 : 800 | — | Kates et al., 1984 [12] | 1 : 3667 | 7,155 |
Leung, 1986 [13]
| 1 : 3392 | 50,892 |
Bedi and Yan, 1990 [14]
| 1 : 1442 | — | Rusmah, 1991 [15] | 1 : 2325 | 9,600 | To, 1991 [16] | 1 : 1118 | 53,678 | De Almeida and Gomide, 1996 [17] | 1 : 21.6 | 1,019 | Alaluusua et al.,* 2002 [18] | 1 : 1000 | 34,457 (1997–2000) | El Khatib et al., 2005 [19] | 1 : 3400 | 17000 (1984 and 2001) |
|
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