Table 1. Epidemiological Studies on the Prevalence of Tic Disorders in Children.
| First Author, Year | Country | Age (Years) | Screening | Sample Size | Point Prevalence (%) | Period Prevalence (%) |
| Boncour, 191059 | France | 2–13 | Teacher observation | 1759 | 23.7 | – |
| MacFarlane, 195426 | USA | 1–14 | Parent interview | 116 | – | 25 |
| Lapouse, 196427 | USA | 6–12 | Parent interview | 482 | 12 | – |
| Pringle, 196728 | UK | 7 | Parent questionnaire, medical history and examination | 7949 | 7.7 | – |
| 7958 | ||||||
| 7965 | ||||||
| Rutter, 197060 | UK | 9–12 | Parent and teacher interview | 2057 | ||
| Non psychiatric sample | 1919 | 4 | ||||
| Psychiatric sample | 95 | 18 | ||||
| Non psychiatric epileptic sample | 26 | 8 | ||||
| Psychiatric epileptic sample | 17 | 24 | ||||
| Shepherd, 197161 | UK | 5–15 | Parent questionnaire | 6290 | – | 20 |
| Achenbach, 1978–930,31 | USA | 6–16 | Parent questionnaire | 2200 | ||
| Population sample | 1100 | 7.7 | ||||
| Referral sample | 1100 | 28.8 | ||||
| Kurlan, 200144 | USA | 8.5–17.5 | Parent questionnaire | |||
| Technician exam | ||||||
| Special education | 341 | 29 | ||||
| Regular education | 1255 | 17.9 | ||||
| Khalifa, 200350 | Sweden | 7–15 | Parent questionnaire | |||
| Medical exam | ||||||
| Regular education | 4438 | 6.3 | ||||
| Special education | 41 | 46.3 | ||||
| Lanzi, 200422 | Italy | 6–11 | Teacher observation | 2347 | 2.9 | |
| Ooki, 200533 | Japan | 3–15 | Questionnaire | 1986 | 6.8 (males)4.1 (females) | |
| Linazasoro, 200662 | Spain | 4–16 | Parent and teacher questionnaireObservation | 867 | 6.5 | |
| Stefanoff, 200724 | Poland | 12–15 | Parent and teacher questionnaireExam | 1579 | 6.7 | 9.9 |
| Schlander, 200936 | Germany | 0–50+ | Database code | 2.238.460 | 0.2 | |
| Cubo, 201148 | Spain | 6–16 | Parent, teacher questionnaire | |||
| Observation | ||||||
| Neurologist interview | ||||||
| Regular education | 741 | 16.8 | ||||
| Special education | 54 | 20.3 |