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Services Research Outcomes Study (SROS)

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  1. NONRESPONSE ANALYSIS

NONRESPONSE ANALYSIS

The project team used data collected during abstraction of patient records to compare the characteristics of SROS respondents and nonrespondents, as presented in Table 2-3.

Table 2-3. Comparisons of sample respondents/nonrespondents, using data from administrative records of cooperating providers (N=2,770)

Statistic


Respondents


Nonrespondents



(Base n max= 1,799)


(Base n max= 971)

Panel 1. Means


m

n


m

n

Length of sample episode (in months)


4.4

1,778


4.0

958

Age at admission (in years)

*

30.6

1,747


31.7

950

Number of different treatment services

received during this episode


3.3

1,698


3.5

920

Number of treatment episodes in lifetime


3.3

937


3.0

504

Panel 2. Percentages


%

n


%

n

Female

*

30.4

1,794


24.9

969

Black (non-Hispanic)


29.3

1,702


28.7

900

American Indian/Alaskan Native


1.5

1,702


1.0

900

White (non-Hispanic)


67.7

1,702


68.7

900

Hispanic

*

12.2

1,011


20.1

532

At least high school education


59.0

1,589


62.2

855

Prison or jail record prior to admission


49.7

1,026


49.7

563

DWI/DUI prior to admission


45.7

1,045


50.3

555

Other arrests prior to admission


70.7

1,222


68.2

682

Self as primary referral source


29.0

1,650


28.3

893

Legal system as primary referral


25.7

1,650


22.7

893

Public as primary payment source


28.8

1,439


32.0

762

Planned treatment greater than 25 days


69.0

598


67.2

344

Psychiatric history at admission


26.1

1,202


24.3

635

Employed at admission


39.1

1,621


37.9

890

Chronic medical condition at admission


29.2

1,254


33.2

660

Cocaine as primary drug at admission


15.5

1,360


17.0

746

Heroin as primary drug at admission


14.3

1,360


16.5

746

Alcohol as primary drug at admission


48.6

1,360


46.3

746

Prescribed medications during treatment


55.1

1,374


56.4

768

Length of treatment less than 25 days


64.0

1,778


60.6

954

Tested for drug or alcohol abuse during

sample episode


61.8

1,213


66.0

700

Ever used needles to inject drugs

*

43.5

928


49.9

521

Completed treatment plan before discharge


50.2

1,738


48.4

939








See footnotes at end of table







Percentages


%

n


%

n

Aftercare plan stated in record


65.6

1,132


67.8

599

Physician notes at admission

*

66.3

1,535


70.7

849

Physician notes at discharge


41.3

1,411


45.6

757

Physician notes at any other time

*

55.2

1,487


59.8

805

Hospital inpatient facility


24.5

1,799


21.6

971

Residential facility


25.8

1,799


28

971

Outpatient methadone maintenance facility


23.5

1,799


23.4

971

Outpatient non-methadone facility


26.2

1,799


27

971

Note: Significant differences between means in Panel 1 were based on two-tailed t tests.

Significant differences between percentages in Panel 2 were based on chi-square tests of

independence.

The table omits 277 cases from the total sample (3,047) who were known to be deceased

[i.e., 277 + 1,799 + 971 = 3,047].

* Difference between respondents and nonrespondents is significant, with p < .05.

Source: Drug Services Research Study/Supplemental Sample Abstraction conducted in 1994 at the 99 participating facilities.

The differences, though statistically significant, were small. An analysis of 36 variables collected by abstraction from client records — virtually all the data pertinent to client characteristics or individual treatment pathways — indicates very few significant differences (at the .05 level) between respondents and nonrespondents. Respondents averaged in age about one year younger (NS [ (NS) These differences are not significant at the .05 level when those who died are classified with respondents.] ) than nonrespondents, had a lower rate with physician notes at admission (NS), a lower rate with physician notes at any other time (NS), a higher rate of female respondents, a lower rate of Hispanic respondents, and a lower rate who used needles to inject drugs (NS). Given the small numbers and size of these differences, the study team did not adjust the data for nonresponse bias.

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