The agreement between current theory and experimental results was good for incidence angles smaller than 15 degrees because the effective mass approximation begins to fail for incidence angles larger than 15 degrees and so does its consequent correction approximation.
The effectiveness of the Australian Medical Sheepskin in the prevention of pressure ulcers was first tested clinically in a randomized controlled trial in 297 elderly orthopedic hospitalized patients with very good results: incidence rate of pressure ulcers was 9.6% in the intervention versus 30% in the control group [ 1].
In other words, the favourable results of the feasibility studies (high proportion of early stage NSCLC, prevalence higher than incidence, good resectability, good 5-year survival, low proportion of invasive procedures for benign lesions, etc).
In interpreting these observations, both assumed that mortality gave a good indication of incidence and treated the data as if they referred to age specific incidence rates.
In those days, leukaemia was highly lethal and mortality was a good proxy for incidence.
Furthermore, the low survival rate means that mortality due to the causes studied is a good approximation of incidence.
For acute myocardial infarction (AMI), hospital discharge data combined with mortality data provide a good guide to incidence.
Although it has a relatively good prognosis, the incidence of thyroid carcinomas is rapidly increasing, and 10 30% of patients have recurrence and/or metastases [ 4, 5].
We also found good agreement on incidence of deliveries (IM: 3.9% ±0.4; HHS: 3.9%), and on hospital deliveries (IM: 61.0%. ± 5.4; HHS: 51.4%).
Although CNR under-represents the disease burden for any country [ 4], it is often a good approximation of incidence in settings where health care system, diagnostics and reporting of tuberculosis is of reasonable quality [ 9].
