My paper with Bridget Dolan, showed that in white British women attending a family planning clinic two 16 item shortened forms of the BSQ had Cronbach's coefficient alpha values in the range .93 to .93 with non-significant differences in mean scores (paired t-tests). Four eight item scales had alpha values ranging from .87 to .92 and very nearly equivalent scores. All scales showed similar correlations with other correlated and discriminant variables (see paper for details).
The six shortened scales and the original 34 item version are enclosed. The mapping of the items from the shortened forms to the original 32 items is as follows. Items 26 and 32 from the BSQ-34, which refer to vomiting and use of laxatives, were dropped from all shortened forms.
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# |
16A |
16B |
8A |
8B |
8C |
8D |
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|
1 |
1 |
2 |
1 |
5 |
4 |
2 |
|||
|
2 |
3 |
4 |
3 |
11 |
6 |
12 |
|||
|
3 |
5 |
6 |
7 |
15 |
13 |
14 |
|||
|
4 |
7 |
12 |
8 |
20 |
16 |
18 |
|||
|
5 |
8 |
13 |
9 |
21 |
19 |
24 |
|||
|
6 |
9 |
14 |
10 |
22 |
23 |
27 |
|||
|
7 |
10 |
16 |
17 |
25 |
29 |
30 |
|||
|
8 |
11 |
18 |
34 |
28 |
33 |
31 |
|||
|
9 |
15 |
19 |
|
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|
10 |
17 |
23 |
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|
11 |
20 |
24 |
|||||||
|
12 |
21 |
27 |
|||||||
|
13 |
22 |
29 |
|||||||
|
14 |
25 |
30 |
|||||||
|
15 |
28 |
31 |
|||||||
|
16 |
34 |
33 |
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