Originally, three further items—

(a) given money to charity, 
(b) done volunteer work for a charity, and 
(c) donated blood—

were also part of this item battery in the GSS. 
However, because Items a and b fit with the other
 studies in terms of content, we decided to 
analyze them separately in Studies 3 and 5. 
Moreover, due to a considerable low item-factor 
correlation (.23 compared with a mean item-factor
 correlation of .56 for the other items), 
we removed Item c from our final scale.