直接面询收集的资料用IBM微机处理，主要用成组和非成组分析方法计算比数比(OR值)。
All data were collected through direct interview. The gathered data were analyzed by methods of matched and unmatched studies in IBM computer, and expressed by odds ratio (OR).
结果：比数比以缓解率30%、50%或中度疼痛缓解和停药后复发计算。
Results Odds ratios were calculated for achievement of 30%, 50%, or moderate pain relief and for withdrawals related to adverse effects.
结果：比数比以缓解率30%、50%或中度疼痛缓解和停药后复发计算。
Results Odds ratios were calculated for achievement of 30%, 50%, or moderate pain relief and for withdrawals related to adverse effects.
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