Socio-Economic Differences in the Lausanne CoLaus Cohort Abstract. The CoLaus study allowed to highlight the existence of broad social inequalities in health among the population of the city of Lausanne. In fact, participants with low socioeconomic status had a higher prevalence of cardio-metabolic risk factors, risk behaviors, sleep disturbances, and higher inflammatory markers compared to the more socio-economically advantaged participants in the study. In most cases, these inequalities are similar to those found in the neighboring cantons and countries.