Addressing patient’s unmet social needs: disparities in access to social services in the United States from 1990 to 2014, a national times series study

Table 3 Differences in the tract level density of social service providers by quartiles of change in 1990 to 2010 median household income and year for tracts that were in the highest quartile poverty in 1990

Predictor Variables	Difference in provider counts/Km² (95% CI) P-value For tracts in the second tertile of population density (248—1,479 people/Km²)	Difference in provider counts/Km² (95% CI) P-value For tracts in the third tertile of population density (> 1,479people/Km²)
Quartiles of Change in Inflation-Adjusted Median Household Income 1990–2010
1^st Quartile	Ref	Ref
2^nd Quartile	0.15 (0.04, 0.26) p = 0.006	0.24 (0.03, 0.44) p = 0.024
3^rd Quartile	0.35 (0.21, 0.49) p < 0.001	0.50 (0.28, 0.73) p < 0.001
4^th Quartile	0.53 (0.37, 0.7) p < 0.001	1.53 (1.23, 1.83) p < 0.001
Quartiles of Change in Inflation-Adjusted Median Household Income 1990–2010 * Year
1^st Quartile * Year	Ref	Ref
2^st Quartile * Year	0.01 (0.004, 0.02) p = 0.001	0.004 (-0.01, 0.02) p = 0.583
3^st Quartile * Year	0.02 (0.01, 0.03) p = 0.001	0.03 (0.01, 0.05) p = 0.001
4^st Quartile * Year	0.04 (0.03, 0.06) p < 0.001	0.09 (0.07, 0.11) p < 0.001

ISSN: 1472-6963