In conclusion, the ID-specific OTHP proved effective for improving occupational performance, fine motor functions and activity participation. The duration (an average of 15 min per session on at least 15 days per month for 20 weeks) of this OTHP program and its training strategies provide a useful reference for OTs during program development and implementation. To increase parental adherence to the home program, OTs should advise parents in setting goals for their children and should monitor their satisfaction with the program.