Table 2.
Effects of Parent Selection to Apply for OHP Coverage and of Selected Parent(s) Obtaining Coverage on Children Obtaining OHP Coverage
| Children With OHP Coverage by Time After Parent Selectiona | ||||||
|---|---|---|---|---|---|---|
| 1–6 mo | 7–12 mo | 13–18 mo | ||||
| Model | %b | OR (95% CI) | %b | OR (95% CI) | %b | OR (95% CI) |
| Intent-to-treat analysesc | ||||||
| Unadjusted | ||||||
| Parent selectedd | 65.8 | 1.26 (1.18–1.35) | 63.1 | 1.19 (1.11–1.27) | 63.2 | 1.14 (1.06–1.22) |
| Parent not selectede | 60.5 | 1 [Reference] | 59.0 | 1 [Reference] | 60.2 | 1 [Reference] |
| Adjustedf | ||||||
| Parent selectedd | 65.5 | 1.18 (1.10–1.27) | 62.6 | 1.11 (1.03–1.19) | 62.8 | 1.07 (0.99–1.14) |
| Parent not selectede | 61.6 | 1 [Reference] | 60.1 | 1 [Reference] | 61.3 | 1 [Reference] |
| Per-protocol analysesg | ||||||
| Unadjusted | ||||||
| Parent selected and obtained OHP coverageh |
76.5 | 2.55 (2.30–2.82) | 70.6 | 1.92 (1.75–2.21) | 69.4 | 1.67 (1.52–1.84) |
| Parent not selected and did not obtain OHP coveragei |
56.0 | 1 [Reference] | 55.5 | 1 [Reference] | 57.6 | 1 [Reference] |
| Adjustedf | ||||||
| Parent selected and obtained OHP coverageh |
75.9 | 2.37 (2.14–2.64) | 69.7 | 1.77 (1.60–1.96) | 68.4 | 1.53 (1.38–1.69) |
| Parent not selected and did not obtain OHP coveragei |
57.0 | 1 [Reference] | 56.5 | 1 [Reference] | 58.6 | 1 [Reference] |
Abbreviations: OHP, Oregon Health Plan; OR, odds ratio.
A child was classified as covered if there was evidence of OHP coverage for more than 50% of the period.
The unadjusted percentages are the observed percentage; the adjusted percentages are estimated from predicted probability of coverage from the models.
To estimate the effect parental selection status had on children’s coverage, we used generalized estimating equation modeling limited to 18 months after a parent was selected to apply for OHP (those not selected were randomly assigned a selection date based on the distribution of selection dates for the selected group).
At least 1 parent was randomly selected to apply for OHP (n = 7798 adults; n = 6238 children).
No parent was randomly selected to apply for OHP (n = 9149 adults; n = 8171 children).
Adjusted for covariates found to be significantly different between selected and unselected groups, including parent’s race/ethnicity, number of children in the household, number of parents in the household on the reservation list, Rural-Urban Continuum Code for the child’s zip code, and whether either parent registrant from the reservation list was probabilistically matched to OCHIN electronic health record data. Missing parental race/ethnicity was included in the models as a separate category with the parental race/ethnicity variable.
To estimate the effect of a parent being selected and obtaining coverage, we used generalized estimating equation modeling limited to children whose parents were selected and received OHP coverage in the first 6 months after the selection date (intervention group) and children whose parents were not selected and did not get OHP coverage in the first 6 months after selection (controls).
At least 1 parent selected to apply ultimately obtained OHP coverage after selection (n = 3354 adults; n = 2577 children).
No parent was randomly selected to apply for OHP and no parent obtained coverage (n = 7436 adults; n = 6675 children).