Table 1.

Distributions of incarceration and census tract-level factors in San Francisco census tracts (n=178) in 2010.

Per census tract	Median	25th percentile	75th percentile	Range
Incarceration rate estimate (per 100,000)1	191.9	93.7	418.0	0–4282.7
% Income below federal poverty line	9.1	5.9	14.9	0–41.1
% African-American	2.6	0.8	8.4	0–72.9
% Female head of household	6.6	3.7	12.3	0–43.9
% Vacant housing units	8.1	5.0	11.6	0–37.3
% Households receiving food stamps	1.6	0.4	4.0	0–32.4

¹Incarceration rate estimates were based on data from four discrete dates (March 30, June 30, September 30, and December 30, 2010). This analysis of incarceration rate estimates was performed for public health evaluation and improvement purposes, and is not an official estimate for the City of San Francisco for 2010.