A large part of this research focuses on life satisfaction changes depending on the multiple causal effect, but in recent years, the impact of life satisfaction on outdoor sports based on the theory of activity sports, has taken on a new dimension with research methods. This article briefly discusses not only some of the most common causal methods on observational data for comparative effectiveness research to implement propensity score matching, but also presents measurement of life satisfaction. Using the sampling group data set consisting of 1,719 mountaineers, trekkers, cyclists as well as those who do not participate in outdoor activities in Turkey, we found that participating in outdoor activities has statistically positive effects on increasing life satisfaction. Another objective was to determine the propensity matching score of these groups.