LDL means low density lipoprotein and the more the level of LDL or LDL particle count in your blood the more you are at risk of developing coronary artery disease or in other words the more you are at risk of having things like a heart attack or a stroke. On the other hand the more the level of HDL the less the risk of you having things like a heart attack or stroke in the future.
Now coming to the normal values of the LDL and HDL particle counts in the blood:
Normal and abnormal values for LDL particle counts are given below. On the extreme left hand side MESA stands for Multi-Ethnic Study of Atherosclerosis which determines your risk for having atherosclerosis.
Normal and abnormal values for HDL are given below along with their interpretation as to what it means (yours was 26.4):
Regarding total particle counts the normal and abnormal values are the following (yours was 2.5)
So, with your LDL particle count of 1686 you fall in the category of "Those with High rate of cardiovascular disease events & High LDL particle concentration" and with your HDL particle count of 26.4 you fall in the category of "Those with lowest total HDL particle concentrations & Highest rates of cardiovascular disease events"