These grouping were made
because: (a) statistically significant associations
were found between neck and shoulder symptoms
(OR ¼ 4.5; 95% CI 1.4–14.6), and hand/wrist and
finger symptoms (OR ¼ 5.0; 95% CI 1.1–22.9); (b)
the number of subjects in each category was
relatively small; (c) these categories are acceptable
in the literature