"If you use withdrawal as a method, pregnancy rates are 22 per cent per annum. If you use condoms it is 18 per cent, if you use the pill it is 9 per cent, and if you use a LARC it is 0.5 per cent."
Dr Pickering says there is a good case for making it an opt-out programme which provides adolescents with the opportunity to have a LARC, rather than having to go and seek care.
"For a programme to be effective you need to get as many people involved as possible and an opt-out programme seems to be more effective. You still get the right to say no and in terms of justice it treats everybody the same."
He says decisions around starting such a programme should be made on pragmatic grounds and transparent moral grounds, rather than on fears such as adolescents becoming more sexually active - something the evidence doesn't support.
"If you look at it rationally and with a sense of what's doing best for people, even with your economic hat on, it makes sense."
Join the conversation on the Herald Life Facebook page