List the ids of all the patients with condition that has a prevalence percentage of 18.8%.
ids of the patients refer to PATIENT from conditions; condition that has a prevalence percentage of 18.8% refers to PREVALENCE PERCENTAGE = 18.8;
SELECT DISTINCT T1.PATIENT FROM conditions AS T1 INNER JOIN all_prevalences AS T2 ON lower(T2.ITEM) = lower(T1.DESCRIPTION) WHERE T2."PREVALENCE PERCENTAGE" = CAST(18.8 AS float)