| Author | Year | Symptoms | Earliest described age |
| Ziehen [13] | 1904 | Hebephrenia Melancholy | 7th year of life 5th year of life |
| Ziehen [14] | 1906 | Anancasm Mania | 8th year of life 10th year of life |
| Geisler & Schröder [15] | 1958 | Masturbation Anxiety states | At all ages Infant age |
| Poznanski, Zrull& Arbor [16] | 1970 | Depression | 3rd year of life |
| Eggers [17] | 1973 | Schizophrenia Delusion | 3rd year of life 7th year of life |
| Kappes [18] | 1981 | Extended attempt at suicide | 6th year of life |
| Schreier [19] | 1986 | Hallucinations | 2nd year of life |
| Nicolsen et al. [20] | 2001 | Childhood psychosis | 7th year of life |