Ietje Perfors

142 Chapter 6 Mental health was assessed at T0 and T5 using the RAND Mental Health Inventory (MHI-5). It includes 5 items, resulting in a score between 0-100. Scores higher than 60 indicate the patient as psychologically healthy. 21 Self-efficacy was measured with three validated questionnaires. 22–24 The General Self-Efficacy Scale (GSE) assessed the self-belief to cope with a variety of difficult demands in life at T0 and T5 using a questionnaire with 10 hypotheses. 22 A score was calculated, which ranged from 10-40. A higher score indicates higher self-efficacy. 22 Perceived Efficacy in Patient- Physician Interactions (PEPPI-5) was assessed at T0, T1 and T5. The PEPPI-5 includes 10 items resulting in a score from 5-25. 23 A higher score indicates higher perceived self-efficacy. Mastery level is an element of self-efficacy referring to “the extent to which an individual regards their life chances as being under their personal control rather than fatalistically ruled”. 24 Mastery was measured with the Pearlin Mastery Scale at T0 and T5. It is a 7-item questionnaire designed to measure self-concept and the extent to which individuals perceive themselves in control of forces that significantly impact their lives. 24 From these items a score could be calculated ranging from 5-35, with higher scores indicate higher levels on mastery. 24 Adherence to the GRIP intervention Adherence to the TOC was assessed using free text and coded information in the GPs’ EMR. The HON registered number and content of follow-up visits by using a personal plan and checklist. Data on collaboration between GP and HON was extracted from the EMR of the GP and based on data provided by the HON. Statistical analysis All analyses were performed following the intention to treat principle. Baseline characteristics were shown by calculating means or medians for continuous variables and frequencies or percentages for categorical variables. Characteristics of patients who completed the study and patients who dropped-out were compared using independent T-tests for continuous variables and Pearson’s Chi-square used for categorical variables.