Factors Associated With Rehospitalization Among Veterans in a Substance Abuse Treatment Program

This retrospective study used data from a sample of 600 homeless Vietnam veterans, aged 46 to 65 years. Systematic random methods were used to select the sample from the population of inpatients in a substance abuse treatment program in a VA medical center in the Midwest. No differences were found in the demographic characteristics of the sample and the larger population of veterans who had been treated in the program. For example, 71 percent of both groups had been treated for substance abuse, and 40 percent of both groups had been admitted to a psychiatric hospital.

The study was approved by the VA institutional review board. After written informed consent was obtained, participants were interviewed on three separate days within two weeks of entering the domiciliary treatment program. The participants had entered the program directly after discharge from a 30-day inpatient detoxification intervention. The program integrated drug and mental health treatment, and its services focused on helping participants find and sustain employment and housing and achieve independent living.

The majority of measures were subscales from Hudson's Multi-Problem Screening Inventory (6). Twelve subscales were used. Three addressed childhood experiences—family attachment, physical abuse, and sexual abuse—and nine assessed current depression, fearfulness, stress, aggression, guilt, confused thinking, disturbing thoughts, suicidal thoughts, and self-esteem.

The 30-item Self-Efficacy Scale, the 12-item Multidimensional Scale of Perceived Social Support, and the 12-item Ego Identity Scale were used (7). A five-item scale of religiosity (5) addressed prayer, Bible study, discussion of religion, church attendance, and belief in a supernatural being.

Information about age, years of education, years of alcohol and other drug use, usual employment pattern over the past three years, the number of times treated for substance abuse, and the number of previous psychiatric hospitalizations was obtained from the Addiction Severity Index (ASI) (8).

Information about readmission of the participants to the hospital for psychiatric or substance abuse treatment within two years after discharge from the treatment program was obtained from the computer databases of all VA hospitals in the state in which the study was conducted and in the surrounding states.

Multicollinearity was checked with principal-components analyses, a correlation matrix, and tests of tolerance and the variance inflation factor. Tolerance is the proportion of the variance in a variable not associated with predictors already entered into the equation (1 minus r²) (9). On the basis of these tests, only certain scales from the Multi-Problem Screening Inventory were retained for analyses. Missing data was not a significant factor and did not amount to more than 3 percent of cases for any variable.

Of the 600 veterans, 432 (72 percent), were readmitted to a hospital for substance abuse or psychiatric problems during the two-year follow-up period.

Cox's proportional hazards model was used because it is not based on any assumption about the nature or shape of the underlying survival distribution (10)—that is, about the proportion of participants who would remain unhospitalized and for how long.

The hazard model indicated that the significant predictors of rehospitalization were self-efficacy, social support, number of previous psychiatric hospitalizations, sexual abuse before age 18, years of drug use, depression, number of times referred for drug treatment, self-esteem and physical abuse before age 18, age, and family attachment. Data are standardized, and thus the hazard rate in Table 1 represents the change in the readmission rate for a change in the predictor variable of one standard deviation.

This study assessed hospital recidivism among homeless Vietnam veterans with substance use disorders, many of whom also had other psychiatric problems. The results showed that most of the variables examined as predictors were significantly associated with rehospitalization. The study is useful because it examined a wide range of factors over the life span. For example, the results suggest that early experiences in a person's family of origin may have long-term influences extending into adulthood. Insecure familial attachment and early physical and sexual abuse may instill deep feelings of despair and self-depreciation and inhibit the development of personal strengths such as self-efficacy. These adverse feelings and deficits in personal attributes may render persons vulnerable to depression and substance abuse (4). Assessment of factors such as unemployment, lack of social support, and lack of belief in an omnipotent being suggest that these vulnerabilities are related to rehospitalization (2). A history of drug abuse or of other psychiatric problems is also a well-documented predictor. This provides preliminary evidence that some factors that have not been extensively explored as predictors of rehospitalization, such as early physical and sexual abuse and self-efficacy, may be relatively strong predictors. However, a salient limitation of this study is that causality cannot be inferred because of the cross-sectional design. This problem is compounded by the reliance on self-reports about experiences that occurred before the age of 18. Responses could reflect problems of recall, including neurological damage, and present familial interactions. The modest correlations between the items on the scale that assessed attachment to the family of origin and the items on the ASI about present family relationships suggest that the participants made a distinction between past and present attachment to their families. However, the interrelationships between predictors need to be investigated in longitudinal studies.

The results suggest that treatment for this population should target residual feelings from childhood and attributions about the self in addition to substance abuse and psychiatric problems. Cognitive strategies aimed at bolstering self-efficacy and lessening depression that are used in conjunction with substance abuse and psychiatric treatment may help program participants secure and sustain employment. Viable social support networks, including strong family relationships, can supplement formal services in helping participants achieve and maintain independent living. This study provides some initial evidence that childhood experiences and present attributions about the self have a substantial influence on the ability of persons being treated for chronic substance abuse to live stably in the community.

Dr. Benda is professor in the School of Social Work at the University of Arkansas at Little Rock, Little Rock, Arkansas 72204 (e-mail, [email protected]).