Table 3. The Perceived Group Reinforcement Scale (PGRS).

1.	I like this group.
2.	The members of this group are interested in what I have to say.
3.	The members of this group value my ability to contribute.
4.	My presence makes a difference to this group.
5.	I see myself as an important part of this group.
6.	I am satisfied with this group.
7.	The members of this group underestimate my ability to contribute.
8.	I often disagree with the members of this group.
9.	I feel included in this group.
10.	In spite of individual differences, a feeling of unity exists in this group.
11.	My presence is irrelevant to this group.
12.	If an opportunity occurred outside this lab, I would look forward to being part of this group in the future.

Note: Each item was rated on a scale ranging from 1 (“strongly agree”) to 9 (“strongly disagree”). Item numbers 7, 8, and 11 were reverse scored.