Jul 2005 - Chapter 3.8, 3.9, 3.10, 3.11, 3.12, 3.13 and Chapter 4 have been revised as there was an error in the calculation of age- and sex-standardised rates using Poisson regression. A new methodology of direct and indirect age- and sex-standardisation of rates has been applied in each of these sections and chapters. Some changes to text to improve clarity.