Well it’s the ones that you, its subjective you can’t measure them so you haven’t got a, you know a number to support, to support it as such so when you ask the patient and there is a range of responses, the Epworth [Sleepiness Scale] is a good example, you know recall is not always 100 % accurate, so they may well doze off in certain scenarios, and people may have a different interpretation what they class as low, high or moderate chance of dozing off and that would skew the score. Some people come with a score of 24 and are slim and they clearly haven’t got sleep apnoea whereas some people might have an 8 or a 9…. It is a bit of crystal ball gazing isn’t it, because the ones where you have basically got numbers like systolic blood pressure, LDL cholesterol whatever the ones where you have got actual numbers, that, that it trumps your acumen frankly because you know you can’t, that is done on an epidemiological average study of how likely this chap is to have a vascular event in the next 10 years or whatever, you can’t crystal ball gaze the ones where it is about the, the here and now and there is lots of subjectivity within the score FG2R6 (family physician, medically qualified 10 years)