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. Author manuscript; available in PMC: 2013 Sep 21.
Published in final edited form as: J Drug Issues. 2005 Jul 1;35(3):507–528. doi: 10.1177/002204260503500305

Table 2.

Summary Statistics of Regressors1

Modality
Full Sample
Methadone
Drug Free
Variable Name Definition N = 6,013 MC = 0
N = 378
MC = 1
N = 232
MC = 0
N = 2,198
MC = 1
N = 3,205
MC 0-1 dummy variable, = 1 if facility has agreements or
contracts with managed care organizations to provide
substance abuse treatment services
0.57
(0.49)
0
(0)
1
(0)
0
(0)
1
(0)
Methadone 0-1 dummy variable, = 1 if facility dispenses methadone 0.10
(0.30)
1
(0)
1
(0)
0
(0)
0
(0)
Control: Private & for profit 0-1 dummy variable, = 1 if facility is operated by a
private for-profit organization
0.35
(0.48)
0.56
(0.50)
0.35
(0.48)
0.37
(0.48)
0.31
(0.46)
Control: Private & nonprofit 0-1 dummy variable, = 1 if facility is operated by a
private nonprofit organization
0.54
(0.50)
0.33
(0.47)
0.54
(0.50)
0.48
(0.50)
0.59
(0.49)
Control: Public 0-1 dummy variable, = 1 if facility is operated by a public
organization
0.11
(0.32)
0.11
(0.31)
0.11
(0.31)
0.15
(0.36)
0.09
(0.29)
Focus: substance abuse 0-1 dummy variable, = 1 if primary focus of facility is
substance abuse treatment services
0.67
(0.47)
0.96
(0.19)
0.92
(0.27)
0.71
(0.45)
0.58
(0.49)
Focus: mental health &
  substance abuse
0-1 dummy variable, = 1 if focus of facility is a mix of
mental health and substance abuse treatment services
0.33
(0.47)
0.04
(0.19)
0.08
(0.27)
0.29
(0.45)
0.42
(0.49)
Hospital 0-1 dummy variable, = 1 if facility is located in, or
operated by, a hospital
0.09
(0.29)
0.15
(0.36)
0.16
(0.36)
0.03
(0.18)
0.12
(0.33)
Solo practice 0-1 dummy variable, = 1 if facility is a private solo
practice
0.08
(0.27)
0.12
(0.33)
0.01
(0.11)
0.12
(0.32)
0.05
(0.23)
Halfway house 0-1 dummy variable, = 1 if facility operates a halfway
house for substance abuse clients
0.06
(0.24)
0.01
(0.05)
0.04
(0.19)
0.04
(0.20)
0.08
(0.27)
Regfda2 0-1 dummy variable, = 1 if facility operates a narcotic
treatment program regulated by the FDA
0.97
(0.17)
0.97
(0.17)
0.97
(0.17)
N/A N/A
Accredited 0-1 dummy variable, = 1 if facility is accredited by
JCAHO, CARF or NCQA
0.28
(0.45)
0.30
(0.46)
0.42
(0.49)
0.15
(0.36)
0.35
(0.48)
Licensed by state 0-1 dummy variable, = 1 if facility is licensed by a state
substance abuse agency
0.93
(0.26)
0.97
(0.18)
0.97
(0.16)
0.88
(0.32)
0.95
(0.23)
Admissions (log) Size of facility, measured by log of annual admissions 4.90
(1.15)
5.04
(1.06)
5.18
(1.05)
4.75
(1.19)
4.96
(1.13)
Accepts cash or self-payment 0-1 dummy variable, = 1 if facility accepts cash or self-
payment for substance abuse treatment
0.96
(0.21)
0.99
(0.11)
0.99
(0.09)
0.90
(0.30)
0.99
(0.11)
Accepts private health
insurance
0-1 dummy variable, = 1 if facility accepts private health
insurance for substance abuse treatment
0.74
(0.44)
0.39
(0.49)
0.72
(0.45)
0.53
(0.50)
0.93
(0.25)
Accepts Medicaid 0-1 dummy variable, = 1 if facility accepts
Medicaid for substance abuse treatment
0.57
(0.49)
0.52
(0.50)
0.89
(0.32)
0.37
(0.48)
0.70
(0.46)
Accepts Medicare 0-1 dummy variable, = 1 if facility accepts
Medicare for substance abuse treatment
0.36
(0.48)
0.21
(0.41)
0.43
(0.50)
0.22
(0.41)
0.48
(0.50)
Accepts state-financed
health insurance
0-1 dummy variable, = 1 if facility accepts state-
financed health insurance for substance abuse
treatment
0.39
(0.49)
0.10
(0.30)
0.41
(0.49)
0.22
(0.42)
0.53
(0.50)
Receives public funds (not
Medicare, Medicaid)
0-1 dummy variable, = 1 if facility receives
public funds (not Medicare or Medicaid) for
substance abuse treatment
0.65
(0.48)
0.48
(0.50)
0.72
(0.45)
0.64
(0.48)
0.67
(0.47)
Offers payment assistance 0-1 dummy variable, = 1 if facility offers
payment assistance for clients receiving
substance abuse treatment
0.84
(0.37)
0.62
(0.49)
0.83
(0.38)
0.81
(0.40)
0.89
(0.31)
Region: Northeast 0-1 dummy variable, = 1 if facility is located in
CT, MA, ME, NH, NJ, NY, PA, RI, or VT
0.24
(0.42)
0.25
(0.43)
0.49
(0.50)
0.13
(0.33)
0.29
(0.45)
Region: South 0-1 dummy variable, = 1 if facility is located in
AL, AR, DE, DC, FL, GA, KY, LA, MD, MS,
NC, OK, SC, TN, TX, VA, or WV
0.27
(0.45)
0.33
(0.47)
0.21
(0.41)
0.34
(0.48)
0.22
(0.42)
Region: Midwest 0-1 dummy variable, = 1 if facility is located in
IL, IN, IA, KS, MI, MN, MO, NB, ND, OH, SD,
or WI
0.26
(0.44)
0.15
(0.36)
0.15
(0.36)
0.22
(0.41)
0.30
(0.46)
Region: West 0-1 dummy variable, = 1 if facility is located in
AK, AZ, CA, CO, HI, ID, MT, NV, NM, OR,
UT, WA, or WY
0.23
(0.42)
0.27
(0.44)
0.15
(0.35)
0.31
(0.46)
0.18
(0.39)
Metropolitan area 0-1 dummy variable, = 1 if facility is located
within a metropolitan area
0.75
(0.43)
0.98
(0.15)
0.94
(0.23)
0.77
(0.42)
0.70
(0.46)
Population density – county (log) Log of the number of people in the county per
square mile
6.01
(2.00)
7.30
(1.90)
7.40
(1.64)
5.96
(2.00)
5.79
(1.94)
Population – county (log) Log of the county population 12.52
(1.67)
13.67
(1.22)
13.49
(1.04)
12.57
(1.72)
12.29
(1.64)
Competition – county Herfindahl Index in the county 0.28
(0.29)
0.14
(0.15)
0.12
(0.14)
0.28
(0.29)
0.31
(0.31)
Medicare MC enrollees – county (log) Log of Medicare managed care enrollees in the
county
7.73
(3.30)
9.50
(2.46)
9.69
(1.81)
7.78
(3.37)
7.34
(3.29)
HMO enrollees – county (log) Log of HMO enrollees in the county 10.60
(3.09)
12.18
(2.12)
12.36
(1.42)
10.53
(3.34)
10.33
(3.00)
1

Summary statistics are sample means with standard deviations in parentheses.

2

Applicable only to those facilities that dispense methadone.