This study examines a psychological sense of community consisting of three factors: F1 Group philosophy and member motivation, F2 Contribution and being needed, F3 Comfort and belonging. We use this scale as a new measure of organizational social capital within NPOs, assess members' attachment to the organization, well-being, subjective health, and commitment to community activities, and test the validity of the scale. From 2016 to 2018, we surveyed 2,736 NPO members and analyzed the survey data using the ordered probit model. We conclude that all three factors showed significant positive effects on members' attachment to the organization, well-being, subjective health, and commitment to community activities, with an exception; the positive effect of the reported comfort level on subjective well-being is insignificant. The data also shows that the volunteers have a lower level of F2 than paid workers, and relatively new NPO members have a lower F2 than experienced members who work for NPOs for a longer period of time. In addition, NPO members with long work hours per month have lower subjective health, and if their work hours exceed 100 per month, both members' F1 and F3 levels get lower.
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