Okada L M, Sparer G
Am J Public Health. 1976 Sep;66(9):878-85. doi: 10.2105/ajph.66.9.878.
Household surveys in 12 low income areas found large differences in dental visit rates after control for income and race. The dental visit rate for Red Hook (NYC) exceeded the national rate whereas in seven of the areas the rate was below national averages by 40 per cent or more. The ranges in dental visit rate for low income Blacks was from two-thirds the national rate (in two areas of the South) to two to three times greater than the comparable national rate (in three areas of the Northeast). Lesser but nevertheless large variations among area dental visit rates existed for other race and income groups.
在12个低收入地区进行的家庭调查发现，在控制了收入和种族因素之后，看牙率存在很大差异。红钩区（纽约市）的看牙率超过了全国水平，而在其中7个地区，该比率比全国平均水平低40%或更多。低收入黑人的看牙率范围从全国水平的三分之二（在南方的两个地区）到比全国可比水平高两到三倍（在东北部的三个地区）。其他种族和收入群体的地区看牙率也存在较小但仍然很大的差异。
