Your HDL is 1.8
your LDL is 1.7
your total is 4.5, (which is HDL + LDL + other bits and bobs, all calculated according to a formula).
If you want to go into more detail:
Your total cholesterol (4.5) divided by your HDL (1.8) gives the cholesterol/HDL ratio of 2.5.
(Some authorities turn this sum upside down and look at HDL divided by total cholesterol. Yours would be 0.4. Greater than 0.24 is "good", which yours is.)
Triglycerides (yours are 2.2) divided by HDL (yours is 1.8) is supposed to be a useful figure. Quick use of a calculator shows yours to be 1.22. Less than 2 is described as "good", which yours is.
Sally