In order to clarify the relationship between human social interaction and mental health, we measured face-to-face communication pattern for a few months and conducted a questionnaire on mental health in two organizations in real world. Face-to-face interaction data were measured using wearable sensing system in two organizations in Japan. We extracted some feature values from those two kind data and investigated correlation between them. In this study, we reconsidered social network centrality which means the connection strength between people. We classified the group size of simultaneous interaction and duration of interaction. As results, we found that these factors affected the correlation coefficients between face-to-face interaction and degree of stress.