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. Author manuscript; available in PMC: 2014 Dec 1.
Published in final edited form as: JAMA Psychiatry. 2013 Dec;70(12):1355–1362. doi: 10.1001/jamapsychiatry.2013.2169

Table 2.

Descriptive statistics for states implementing or extending substance use disorder (SUD) parity laws between 2000 and 2008, versus the states with no change in SUD parity status.

Any Change in Parity No Change in Parity Mean- Difference Data Sources
Always Parity No Parity No Change Total

Mean (Sd.) Mean (Sd.) Mean (Sd.) Mean (Sd.) p-value
# States-Year Observations 80=10×8 128=16×8 184=23×8 312=39×8 --

Dependent Variable
% SUD Treatment Rate in All Facilities 1.5 (0.4) 1.3 (0.5) 1.4 (0.5) 1.4 (0.5) 0.03 N-SSATS
% SUD Treatment Rate in Facilities
Accepting Private Insurance
1.3 (0.4) 1.0 (0.5) 1.1 (0.5) 1.1 (0.5) <0.001 N-SSATS

% Facilities Accepting Private Insurance 80.3 (9.5) 70.8 (7.7) 64.2 (6.8) 66.2 (7.2) <0.001 N-SSATS

Covariates
% African/Black 6.1 (6.2) 10.4 (9.2) 11.7 (10.6) 11.2 (10.0) <0.001 CPS
% Hispanic/Latino 4.1 (3.2) 9.1 (9.8) 10.5 (10.3) 9.9 (10.1) <0.001 CPS
% Poverty 11.9 (3.0) 11.9 (3.2) 12.4 (2.9) 12.2 (3.0) 0.43 CPS-ASEC
% SUD Prevalence 9.6 (1.2) 9.4 (0.9) 9.3 (1.1) 9.3 (1.0) 0.03 NSDUH
% Medicaid-Eligible 13.4 (3.7) 12.6 (3.5) 12.9 (3.4) 12.8 (3.4) 0.12 CPS-ASEC
$ SAPTBG Funding (per capita) 5.6 (1.1) 5.5 (1.1) 5.4 (0.8) 5.4 (0.9) 0.24 TIE
% Employer-Sponsored Private-Insured 62.2 (6.0) 60.7 (6.2) 59.8 (5.6) 60.1 (5.8) 0.005 CPS-ASEC
% Individual-Purchased Private-Insured 9.5 (2.8) 10.1 (2.9) 9.8 (2.9) 9.9 (2.9) 0.25 CPS-ASEC
% Workforce in 500+ Employers 44.6 (6.4) 48.0 (5.5) 47.8 (5.5) 47.9 (5.5) <0.001 SUSB
% Workforce in 20− Employers 21.2 (4.3) 18.7 (2.8) 19.8 (3.4) 19.3 (3.2) <0.001 SUSB

# Population (1,000,000) 3.0 (2.8) 5.4 (5.2) 7.2 (7.8) 6.5 (6.9) <0.001 PEP

Note:

p-value for mean-difference is calculated based on two sample t-test between 10 states with change in parity (Column 1) and 39 states with no change (Column 4);

N-SSATS: National Survey of Substance Abuse Treatment Services, SAMHSA; CPS: Current Population Survey, Census Bureau; -ASEC: -Annual Social and Economic Supplement; NSDUH: National Survey of Drug Use and Health, SAMHSA; TIE: Treatment Improvement Exchange, SAMHSA; SUSB: Statistics of United States Businesses, Census Bureau; PEP: Population Estimates Program, Census Bureau.