Table 1.
Data elements, measurement, and source
| Variable | Measure | Data source | Collected |
|---|---|---|---|
| OUTCOME | |||
| Adherence to WCC | Categorical: yes or no (from continuous count of visits) | EMR | Once, at end of study |
| PREDICTORS | |||
| • CHILD | |||
| Insurance status | 2 categories: insured or not | Survey1 | Every 6 months |
| Insurance type | 5 categories: Medicaid, CHIP, employer-sponsored, individually-purchased, or other | Survey1 | Every 6 months |
| Health status | 2 categories: fair/poor or good/very good/excellent (dichotomized from 5 categories) | Survey1 | Every 6 months |
| • MOTHER | |||
| Age | Continuous: years | Survey1 | Initial |
| Race | 6 categories: White; Black/African American; American Indian/Alaskan Native; Asian; Native Hawaiian/Other Pacific Islander; Some other race | Survey1 | Initial |
| Educational status | 2 categories: less than high school; high school/GED equivalent/more (dichotomized from 3 categories) | Survey1 | Initial |
| Primipara | 2 categories: primiparous or not | Survey1 | Initial |
| Insurance status | 2 categories: insured or not | Survey1 | Initial & every 6 months |
| Maternal health literacy | 2 categories: adequate or marginal/inadequate (Based on continuous S-TOFHLA score, validated cutpoint at 23 (range 0-36)) |
Survey | Initial |
| Receiving any public assistance (WIC, food stamps, SSI) | Categorical: yes or no | Survey | Initial & every 6 months |
| Maternal health status | Continuous: numerical score from RAND Medical Outcome Study SF-36 subscales | Survey | Initial & every 6 months |
| Household composition | Categorical: father of baby lives at home or not; other adults live at home or not | Survey1 | Initial & every 6 months |
| Maternal employment status | Two categories: full-time employed/student or part-time employed/unemployed looking/unemployed not looking for work Dichotomized from 5 categories |
Survey1 | Initial & every 6 months |
| Average monthly household income | 2 categories: ≤ $500/month or > $500/month Dichotomized at closest value to median from 8 categories: < $250/month; $251 - $500/mo; $501 - $999/mo; $1,000 - $1,499/mo; $1,500 - $1,999/mo; $2,000 - $2,499/mo; $2,500 - $2,999/mo; $3,000 + /mo |
Survey1 | Initial & every 6 months |
| Maternal social support | Categorical: Maternal Social Support Index (range 0-27) classified as low; medium; or high support by tertiles | Survey | 12, 18, and 24 month follow-up |
Survey: Data collected in-person or via telephone using survey instrument & questionnaire
1Items adapted from the National Health Interview Survey