The dataset contains data from everyone who was selected to take part regardless of whether they did (to enable calculation of response rates): to only keep records with survey data use the m_phdq variable (drop everyone with m_phdq~=3)
In the variable labels (S) indicates that the variable is unchanged from the original source and (D) indicates that it is a 'derived' variable, often using more than one source variable. For both types information on where the data come from and how they are processed is found in the 'Recoding and Derivation' section
| Cases: | 865 |
| Variables: | 743 |