Estimating the impact of virus testing strategies on the COVID-19 case fatality rate using fixed-effects models.

The SARS-CoV2 has now spread worldwide causing over four million deaths. Testing strategies are highly variable between countries and their impact on mortality is a major issue. Retrospective multicenter study with a prospective database on all inpatients throughout mainland France. Using fixed effects models, we exploit policy discontinuities at region borders in France to estimate the effect of testing on the case fatality rate. In France, testing policies are determined at a regional level, generating exogenous variation in testing rates between departments on each side of a region border. We compared all contiguous department pairs located on the opposite sides of a region border. The increase of one percentage point in the test rate is associated with a decrease of 0.0015 percentage point in the death rate, that is, for each additional 2000 tests, we could observe three fewer deaths. Our study suggests that COVID-19 population testing could have a significant impact on the mortality rate which should be considered in decision-making. As concern grows over the current second wave of COVID-19, our findings support the implementation of large-scale screening strategies in such epidemic contexts.

Help me quit smoking but don't make me sick! The controversial effects of electronic cigarettes on tobacco smokers.

Despite its increasing use, little is known about the effect of electronic cigarette. This study estimates the impact of the use of electronic cigarettes on tobacco smoking and health among tobacco smokers, using French panel data derived from the Health, Health Care, and Insurance Survey for 2010-2014. We use a difference-in-differences propensity score matching approach to identify the effect of electronic cigarette use on a sample of 982 smokers. We show that the use of electronic cigarettes increases the probability of quitting smoking and reduces the number of regular cigarettes smoked per day. However, we also find evidence that electronic cigarette users have a higher probability of reporting poor health status and suffering from a chronic disease compared with those who only smoke regular cigarettes. Overall, our results do not support the use of electronic cigarettes for tobacco smokers.

Impact of unemployment on self-perceived health : Evidence from French panel data.

This article investigates the impact of unemployment on self-perceived health using the French Longitudinal Labour Force Survey over the period 2013-2016. We apply a difference-in-difference propensity score matching approach to identify the health effect of unemployment. By combining both methods, we minimise selection bias and remove unobserved individual fixed effects that are time-invariant as well as common period effects. In the French context, characterised by high and persistent unemployment and relatively long unemployment spells, we show that the experience of unemployment has no significant effect on self-perceived health. Moreover, we find no heterogenous effect by carrying out separate analyses by age, gender, marital status, education, occupation, employment contract, local unemployment rate, or past labour market history. Robustness checks, performed by testing alternative types of matching technology, different definitions of the unemployment experience, and other measures of health confirm our findings. Health selection and confounding factors appear to be important determinants of the cross-sectional association between unemployment and poor health.