According to the ncep, the optimal level of ldl-c is

According to the NCEP, if a person has no other risk factors, an LDL-C level can be evaluated as follows: Less than 100 mg/dL (2.59 mmol/L) — Optimal. 100-129 mg/dL (2.59-3.34 mmol/L) — Near optimal, above optimal.

I hope this helps.