Low Satisfaction with Normative Life Domains in Adolescents with Anorexia Nervosa

OBJECTIVE: Low satisfaction with normative life domains might be an important factor in the persistence of anorexia nervosa (AN). Initial evidence in non‐clinical samples showed that lower satisfaction with normative life domains was related to more intense eating disorder symptoms. As a critical next step, the current study examined satisfaction with normative life domains in a clinical sample. Specifically, the present study tested whether adolescents with AN reported lower satisfaction with normative life domains than adolescents without an eating disorder. METHOD: Adolescents with AN (n = 69) and adolescents without an eating disorder matched on age, gender and educational level (n = 69) completed the Brief Multidimensional Students' Life Satisfaction Scale to assess satisfaction with five life domains (family, friendships, school, self and living location) and life in general. RESULTS: Adolescents with AN reported significantly lower satisfaction with normative life domains than the comparison group. Subsequent analyses showed that this overall group difference was primarily driven by adolescents with AN reporting lower satisfaction with the self, school experience and life in general. CONCLUSIONS: Findings supported the hypothesis that adolescents with AN show relatively low satisfaction with meaningful, non‐AN‐related life domains. This points to the potential relevance of enhancing satisfaction with specific life domains to optimize treatment effectiveness

Satisfaction with normative life domains and the course of anorexia nervosa

OBJECTIVE: Satisfaction with normative life domains has been proposed as an important factor in the persistence of anorexia nervosa (AN). Initial evidence from a cross-sectional study indicated that individuals with AN reported lower satisfaction with normative life domains than individuals without an eating disorder. As an important next step in understanding causal relations, the present study used a longitudinal design to examine whether an improvement in AN symptoms is paralleled by an increase in satisfaction with normative life domains from baseline to follow-up and whether relatively low satisfaction with normative life domains at baseline is related to less improvement in AN symptoms. METHODS: During baseline and at 1-year follow-up, adolescents with AN (N = 69) completed the Brief Multidimensional Students' Life Satisfaction Scale to measure satisfaction with normative life domains (e.g., friendships, school experience). Furthermore, eating disorder symptoms and BMI were measured. RESULTS: Improvement in eating disorder symptoms, but not in BMI, was paralleled by an increase in satisfaction with normative life domains. Relatively low satisfaction with normative life domains at baseline was not prospectively related to less improvement in eating disorder symptoms or BMI at follow-up. DISCUSSION: Our findings provide initial evidence that satisfaction with normative life domains is a malleable factor which fluctuates with symptom severity in AN. The results of this exploratory study point to the relevance of examining whether targeting satisfactory engagement with specific life domains optimizes treatment effectiveness. PUBLIC SIGNIFICANCE: We explored whether an improvement in anorexia nervosa symptoms from start of treatment to 1-year follow-up would be paralleled by an increase in satisfaction with normative life domains. Improvement in eating disorder symptoms (but not BMI) was indeed related to a concurrent increase in satisfaction with normative life domains. These preliminary results point to the promising possibility that targeting satisfactory engagement with specific life domains may potentially enhance treatment effectiveness

R&D and Non-Linear Productivity Growth of Heterogeneous Firms

The present paper studies the relationship between R&D investment and firm productivity growth by explicitly accounting for non-linearities in the R&D-productivity relationship and inter-sectoral firm heterogeneity. In order to address these issues, we employ a two step estimation approach, and match two firm-level panel data sets for the OECD countries, which allows us to relax both the linearity and homogeneity assumptions of the canonical Griliches (1979) knowledge capital model. Our results suggest that: (i) R&D investment increases firm productivity with an average elasticity of 0.15; (ii) the impact of R&D investment on firm productivity is differential at different levels of R&D intensity - the productivity elasticity ranges from -0.02 for low levels of R&D intensity to 0.33 for high levels of R&D intensity; (iii) the relationship between R&D expenditures and productivity growth is non-linear, and only after a certain critical mass of R&D is reached, the productivity growth is significantly positive;(iv) there are important inter-sectoral differences with respect to R&D investment and firm productivity - high-tech sectors' firms not only invest more in R&D, but also achieve more in tfirms of productivity gains connected with research activities

The Effect of Credit Conditions on the Dutch Housing Market

It is widely perceived that the supply of mortgages, especially since the extensive liberalization of the mortgage market since the 1980s, has had implications for the Dutch housing market. In this paper we introduce a new method to estimate a credit condition index (CCI). The credit conditions index represents changes in the supply of credit over time, apart from changes in interest rates and income. Examples of these changes include (1) the development of markets for financial futures, options, swaps, securitized loans and synthetic securities which allowed for easy access to credit for financial intermediaries, (2) more sophisticated risk management, for example improved initial credit scoring, (3) changes in risk-perception by financial intermediaries due to changes in the macro-economic environment, like rate of unemployment, (4) introduction of new mortgage products, (5) reduced transaction costs and asymmetric information with innovations of IT, telephony and data management and (6) financial liberation. Financial liberation is the relaxation or tightening of credit controls like liquidity ratios on banks, down-payment requirements, maximum repayment periods, allowed types of mortgages, loan-to-value and loan-to-income ratios, etc. The credit conditions index is estimated as an unobserved component in an error-correction model in which the average amount of mortgage is explained by the borrowing capacity and additional control variables. The model is estimated on data representing first time buyers. For first time buyers we can assume that the housing and non-housing wealth is essentially zero. The credit condition index is subsequently used in an error-correction model for house prices representing not only first time buyers, but all households. The models are estimated using quarterly data from 1995 to 2012. The estimated credit condition index has a high correlation with the Bank Lending Survey, a quarterly survey in which banks are asked whether there is a tightening or relaxation of (mortgage) lending standards compared to the preceding period. The credit condition index has explanatory power in the error-correction model for housing prices. In real terms house prices declined about 25% from 2009 to 2012. The estimation results show that 12% point of this decline can be attributed to a decline in the credit conditions index