Comparison of different distance measures to casualty clinic.

Correlation analysis of relationship between mean distance for inhabitants and other distance measures to casualty clinic. The analyses are performed for different maximum distances. r = correlation coefficient.居民平均出行距离与其他至急诊诊所的距离度量指标间关联关系的相关性分析。本次分析针对不同最大出行距离展开。r=相关系数（correlation coefficient）。