When either exacerbation rate or QALY was used as the outcome measure, the investigators say, tiotropium alone had a higher probability of being the best option compared with the other treatments.

• 调查者认为：无论是用恶化率或是QALY作为结果评价指标，去其他治疗方案相比单独应用噻托酚更有可能成为最佳选择。