Abstract
Social stratification and life course approaches are enlisted to study the effects of health and social events on early adult welfare use. Given the strong link between individual and parental economic disadvantage, the mechanisms by which social context affects welfare use are examined. This unique approach is made possible by the linkage of several administrative databases in Manitoba, Canada, allowing for the follow-up of a large population (n = 42,598) and subpopulation of siblings (n = 7920) from birth to age 26. Gradients of inequality were found for many of the predictors. Regardless of background, improved educational achievement and better childhood and adolescent mental health seem likely to decrease the use of welfare in early adulthood. Addressing the risk factors identified in this study would reduce inequities and lower the need for welfare in early adulthood.
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Acknowledgements
This research has been supported in part a Western Regional Training Center studentship, a Graduate Enhancement of Tri Council Stipend (GETS), and a Research Manitoba Graduate Studentship. The funding sources had no involvement in study design, analysis and interpretation of data, in writing the article, and in the decision to submit for publication. None of the authors received any reimbursement for participating in the writing of this paper. The results and conclusions are those of the authors and no official endorsement by the Manitoba Centre for Health Policy, Manitoba Health, or other data providers is intended or should be inferred. Data used in this study are from the Population Health Research Data Repository housed at the Manitoba Centre for Health Policy, University of Manitoba and were derived from data provided by Manitoba Health, Healthy Living and Seniors, Manitoba Education and Advanced Learning, and Manitoba Jobs and the Economy under Project #2013/2014-54. All data management, programming and analyses were performed using SAS® version 9.3. Aggregated Diagnosis Groups™(ADGs®) codes were created using The Johns Hopkins Adjusted Clinical Group® (ACG®) Case-Mix System” version 9.
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Appendices
Appendix 1: Covariates
Covariates | Neighborhood income quintile at birth | ||||
---|---|---|---|---|---|
1 | 2 | 3 | 4 | 5 | |
Moved | |||||
Ages 0–3 | 3284 | 3410 | 3368 | 3936 | 3683 |
Ages 4–8 | 3923 | 3888 | 3891 | 4607 | 4737 |
Ages 9–13 | 3271 | 2773 | 2696 | 2833 | 2980 |
Ages 14–17 | 2928 | 2212 | 1915 | 1723 | 1949 |
Major mental health conditions | |||||
Ages 0–3 | 17 | 11 | 12 | 17 | 11 |
Ages 4–8 | 35 | 19 | 20 | 32 | 26 |
Ages 9–13 | 71 | 64 | 61 | 72 | 78 |
Ages 14–17 | 306 | 242 | 259 | 241 | 257 |
Minor mental health conditions | |||||
Ages 0–3 | 689 | 765 | 807 | 1062 | 1049 |
Ages 4–8 | 808 | 940 | 1041 | 1232 | 1140 |
Ages 9–13 | 1015 | 1076 | 1235 | 1341 | 1301 |
Ages 14–17 | 1773 | 1819 | 1990 | 2169 | 2195 |
Major injuries | |||||
Ages 0–3 | 2838 | 3230 | 3539 | 4180 | 4179 |
Ages 4–8 | 2731 | 3040 | 3344 | 3985 | 4086 |
Ages 9–13 | 2461 | 2756 | 3109 | 3672 | 3936 |
Ages 14–17 | 2220 | 2376 | 2688 | 3140 | 3313 |
Appendix 2: Model Validation
2.1 Cross Validation
We used tenfold cross validation to check on over-fitting. The following steps used to cross validate our sample are taken from Sainani (2013).
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1.
Randomly divide your data into 10 pieces, 1 through k.
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Treat the 1st tenth of the data as the test dataset. Fit the model to the other nine-tenths of the data (which are now the training data).
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3.
Apply the model to the test data (e.g., for logistic regression, calculate predicted probabilities of the test observations).
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4.
Repeat this procedure for all 10 tenths of the data.
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5.
Calculate statistics of model accuracy and fit (e.g., ROC curves) from the test data only.
Table 7 shows the C-statistics (the measure of fit) for the full model (as presented in the paper) and those obtained after cross-validation. The fit stat
istics were not significantly different, indicating our models were robust.
2.2 Bootstrapping
Bootstrapping was done to determine robustness of the standard errors associated with our estimates. Unrestricted random sampling with replacement was done at the individual level; each outcome was modelled 500 times with different randomly selected samples. Table 8 highlights the similarities between the confidence intervals from the original models and the bootstrapped confidence intervals; the significant predictors remain the same between the two models.
Appendix 3: Specific Mental Health Conditions
Specific mental health conditions are defined using ICD codes from physician claims and hospitalizations. All medical records used ICD-9-CM codes during the relevant period; however, hospital discharge codes switched from ICD-9-CM to ICD-10-CA/CII in 2004/05. These ICD-10 files were converted to ICD-9-CM files using an existing crosswalk (MCHP 2006). The ICD-9-CM system classifies mental, behavioral and neurodevelopmental disorders under codes 290–319 (CDC 2012). Only diagnoses with at least 6 individuals in each subgroup are included to protect the privacy of individuals.
Among welfare recipients, the percentage of individuals in each neighborhood income quintile with a mental health diagnosis grew as neighborhood affluence increased (with the exception of ‘hyperkinetic syndrome of childhood’ and ‘nondependent abuse of drugs’) (Fig. 2). Access to services does not seem to be an issue; the utilization of mental health services is relatively constant across quintiles for those not using welfare.
Appendix 4: Gradient in Odds Ratios across Neighborhood Income Quintiles
For each covariate, estimates from each of the five logistic regressions were modelled as a general linear model with income in the corresponding quintile (1–5) as the outcome. Since estimates are from different populations, bootstrapping was done to determine the standard error of the slope (with 500 replications) (Efron and Tibshirani 1998). Confidence intervals were constructed from the bootstrapped standard errors; if the confidence interval did not contain zero then the slope (or gradient) was deemed significant. See Table 9.
Appendix 5: CFS Models and Variable Correlations
See Table 10.
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Wall-Wieler, E., Roos, L.L., Chateau, D. et al. Social Context of Welfare in Manitoba, Canada. Soc Indic Res 135, 661–682 (2018). https://doi.org/10.1007/s11205-016-1493-0
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DOI: https://doi.org/10.1007/s11205-016-1493-0