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Survival analysis applied to proportion data: comparing mammography visits in high and low repeat rate facilities

机译:生存分析应用于比例数据:比较高重复率和低重复率设施中的乳房X光检查

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We examined the relationship between the proportion of time spent in the mammography exam room relative to the total visit time and the rate of repeat visits across mammography facilities. We hypothesized that the means for these proportions would be greater among facilities with high repeat rates compared to those with low repeat rates. The beta distribution was used to model the proportions. However, not all of the observations were observed as some were (right- or interval-) censored due to the inability to observe complete information (e.g., time of arrival at the facility) to calculate the proportions for some observations. Using a maximum likelihood approach, we estimated the mean proportion of time spent during appointments on the actual exams. To analyze these data we utilized survival analysis methods, which typically are applied to data on time scales, to analyze these data restricted to the range (0, 1). We found that facilities with high repeat mammography rates on average had a greater proportion of their visits spent receiving the exams than the low repeat rate facilities (p = 0.0003). Women from low repeat rate facilities spent on average 45 % of their appointment time engaging in the exam; thus, these women averaged more time waiting for the exam to begin than receiving the exam. Conversely, those from high repeat rate facilities averaged more of their appointment time engaging in the mammographic exams. These findings were consistent with our hypothesis that women would have greater satisfaction with their mammography appointments-and thus be more likely to return for routine screening-in facilities where their appointments were more efficient.
机译:我们检查了在乳腺X射线摄影检查室中花费的时间相对于总访问时间的比例与跨乳腺X射线摄影设施重复访问的比率之间的关系。我们假设在重复率高的设施中,这些比例的平均值将比重复率低的设施更大。 Beta分布用于模拟比例。但是,由于没有观察到完整的信息(例如到达设施的时间)来计算某些观察值的比例,因此并未观察到所有观察值,因为对某些观察值进行了(正确或间隔)检查。使用最大似然法,我们估计了约会期间实际考试所花费时间的平均比例。为了分析这些数据,我们使用了生存分析方法,通常将其应用于时间尺度上的数据,以分析限制在(0,1)范围内的这些数据。我们发现,与重复率较低的机构相比,重复钼靶检查率较高的机构所花费的访问时间平均要多于重复率较低的机构(p = 0.0003)。低重复率机构的女性平均花费预约时间的45%参加考试;因此,这些妇女平均等待考试的时间比接受考试的时间长。相反,来自高重复率机构的患者平均要花费更多的预约时间进行乳房X线检查。这些发现与我们的假设相符,即女性对乳房X线照相术的任命会更加满意,因此更有可能返回常规筛查的场所,因为她们的任命效率更高。

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