Post by kwombles on May 16, 2009 22:39:43 GMT -5
Ozonoff et al. 9 (5): 461. (2005)
Parental report of the early development of children with
regressive autism: The delays-plus-regression phenotype
“Many researchers have categorized individuals with autism according to their pattern of onset (e.g. Creak, 1961; Hoshino et al., 1987; Rogers and DiLalla, 1990; Short and Schopler, 1988). Two groups are generally
described: an early onset group demonstrating symptoms within the first year or so of life, and a regressive group who develop typically for a period and then experience a loss of skills that coincides with the onset of autism. Studies suggest that the majority of children with autism fall in the early onset group. The frequency with which regression occurs is not known. Prevalence estimates depend upon how regression is defined, as well as sampling methods. In clinical samples, regression has been found in as low as 20 percent (Lord, 1995) and as high as 50 percent (DeMyer, 1979) of participants, with two of the larger studies finding rates around 30 percent (Kurita, 1985; Tuchman and Rapin, 1997). Two recent epidemiological studies found regression in 15.6 percent (Fombonne and Chakrabarti, 2001) and 27 percent (Lingam et al., 2003) of population-based samples.”
Parental report of the early development of children with
regressive autism: The delays-plus-regression phenotype
“Many researchers have categorized individuals with autism according to their pattern of onset (e.g. Creak, 1961; Hoshino et al., 1987; Rogers and DiLalla, 1990; Short and Schopler, 1988). Two groups are generally
described: an early onset group demonstrating symptoms within the first year or so of life, and a regressive group who develop typically for a period and then experience a loss of skills that coincides with the onset of autism. Studies suggest that the majority of children with autism fall in the early onset group. The frequency with which regression occurs is not known. Prevalence estimates depend upon how regression is defined, as well as sampling methods. In clinical samples, regression has been found in as low as 20 percent (Lord, 1995) and as high as 50 percent (DeMyer, 1979) of participants, with two of the larger studies finding rates around 30 percent (Kurita, 1985; Tuchman and Rapin, 1997). Two recent epidemiological studies found regression in 15.6 percent (Fombonne and Chakrabarti, 2001) and 27 percent (Lingam et al., 2003) of population-based samples.”