对岩块地表837个露头的节理进行测量和统计分析(节理优势组、平均间距和平均迹长等)。

Dominant group, average spacing and average length of joints are carried out with statistical analysis using data measured from 837 outcrops in these two blocks.

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然而，越来越多块组一级的分析确认为一个适当的地理，了解健康（克里格，威廉姆斯，和莫斯，1997；

However, increasingly, block-group level analyses are recognized as an appropriate geography to understand neighborhood influences on health (Krieger, Williams, & Moss, 1997;

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