Table 4.
Select variables, origin data sources, and percent missingness in the final combined data resource
| Description of variable | Data source | Percent missing (%) |
|---|---|---|
| Birth weight | Vital Statistics | 0.26 |
| Cervical abnormalities | Hospital Discharge Data | 0.00 |
| Chorioamnionitis | Vital Records Hospital Discharge Data |
0.00 |
| Cleft lip or palate | Vital Records Hospital Discharge Data |
0.00 |
| Congenital cardiac anomaly | Vital Records Hospital Discharge Data |
0.00 |
| Congenital pulmonary anomaly | Vital Records Hospital Discharge Data |
0.00 |
| Congenital spinal anomaly | Vital Records Hospital Discharge Data |
0.00 |
| Maternal diabetes | Vital Records Hospital Discharge Data |
0.00 |
| Fetal Distress | Vital Records Hospital Discharge Data |
0.00 |
| Gestational age at birth | Vital Records | 0.05 |
| Gestational age at enrollment | Vital Records Home Visiting Program |
0.00 |
| Home visiting agency | Home Visiting Program | 0.00 |
| Home visit frequency | Home Visiting Program | 0.00 |
| Home visiting referral source | Home Visiting Program | 0.00 |
| Household income | Home Visiting Program | 15.46 |
| Human immunodeficiency virus | Hospital Discharge Data | 0.00 |
| Induction of labor | Vital Records Hospital Discharge Data |
0.00 |
| Infant age at death | Hospital Discharge Data Vital Records |
0.00 |
| Infant length of stay | Hospital Discharge Data | 14.27 |
| Infant mechanical ventilation | Vital Records Hospital Discharge Data |
0.00 |
| Insurance type | Vital Records Hospital Discharge Data |
0.31 |
| Intrauterine growth retardation | Hospital Discharge Data | 0.00 |
| Intraventricular hemorrhage | Hospital Discharge Data | 0.00 |
| Living arrangement | Home Visiting Program | 8.12 |
| Marital status | Vital Records Home Visiting Program |
0.21 |
| Maternal age | Vital Records | 0.00 |
| Maternal body mass index | Vital Records | 7.96 |
| Maternal contact with baby’s father | Home Visiting Program | 9.88 |
| Maternal education | Vital Records Home Visiting Program |
0.26 |
| Maternal ethnicity | Vital Records Home Visiting Program |
0.00 |
| Maternal hypertension | Vital Records Hospital Discharge Data |
0.00 |
| Maternal hypothyroidism | Hospital Discharge Data | 0.00 |
| Maternal race | Vital Records Home Visiting Program |
0.00 |
| Method of delivery | Vital Records Hospital Discharge Data |
0.00 |
| Multiple gestation pregnancy | Vital Records | 0.00 |
| Necrotizing enterocolitis | Hospital Discharge Data | 0.00 |
| NICU admission | Vital Records | 0.00 |
| Oligohydramnios | Hospital Discharge Data | 0.00 |
| Percent below poverty level, by census tracta | American Community Survey | 0.00 |
| Placental disorders | Hospital Discharge Data | 0.00 |
| Preeclampsia | Hospital Discharge Data | 0.00 |
| Preterm labor | Hospital Discharge Data | 0.00 |
| Previous fetal loss, stillbirth or neonatal death | Vital Records Hospital Discharge Data |
0.00 |
| Premature rupture of membranes | Vital Records Hospital Discharge Data |
0.00 |
| Retinopathy of prematurity | Hospital Discharge Data | 0.00 |
| Sexually transmitted infections | Vital Records Hospital Discharge Data |
0.00 |
| Substance use—alcohol | Home Visiting Program Hospital Discharge Data |
0.00 |
| Substance use—cigarettes | Home Visiting Program Vital Records Hospital Discharge Data |
0.00 |
| Substance use—other drugs | Home Visiting Program Hospital Discharge Data |
0.00 |
| Total infant hospital charges | Hospital Discharge Data | 15.05 |
| Townsend index scorea,b | American Community Survey | 0.00 |
Clinical variables from hospital discharge and/or vital records data were constructed as binary indicator variables based on the presence of available data to confirm the diagnosis
a
Available as five-year estimates through the U.S. Census Bureau
b
The Townsend Index score is calculated as a sum of the standardized scores for four census tract-level variables: (1) percentage unemployed, (2) percentage of households without access to a car, (3) percentage of all households renting, and (4) percentage of households with crowded housing. Higher Townsend Index scores reflect higher levels of deprivation and social disadvantage