In order to qualify for inclusion in the performance tables, a survey of at least 5% of new patients attending in a three month period had to be performed. The guidelines stipulate that time of arrival must be the time the patient first enters the department. Where the Audit Commission's auditors judged the data collection systems to be satisfactory, star ratings have been allocated. Only 186 units have been awarded a star rating. The star ratings are presented in the form of league tables, and claim to "show performance at a glance". One star means that less than 80% of patients were assessed immediately they arrived in the department, two stars mean 80-84%, three stars 85-90%, four stars 90-94%, and five stars 95% or more.