Table 4. Proportion of patients experiencing pain relief with opioid analgesic treatment by duration of treatment (n=2,037).
Values presented in parentheses are %.
a)Pearson's chi-square test was used to test for statistically significant association between opioid therapy duration and experience of relief (Yes/No) (p=0.013); b)Data on the duration of opioid therapy and experience of pain relief (Yes/No) were not obtainable for 431 patients; c)Percentages given in brackets indicate the proportion experiencing pain relief (Yes/No) for each treatment duration category.