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Table 3 Differences in probability of low birth weight in relation to WIC and maternal characteristic interaction effects before and during the Great Recession using a linear probability regression model

From: The effect of women, infant, and children (WIC) services on birth weight before and during the 2007–2009 great recession in Washington state and Florida: a pooled cross-sectional time series analysis

 BaselineRecession
Coef. (95% CI)Coef. (95% CI)
Maternal WIC
 Not EnrolledReferentReferent
 Enrolled0.005 (− 0.02, 0.03)0.016 (− 0.00, 0.04)
Maternal Race/Ethnicity
 White, Non-HispanicReferentReferent
 White, Hispanic0.019 (0.01, 0.03)0.019 (0.01, 0.03)
 Black, Non-Hispanic0.084 (0.07, 0.10)0.079 (0.07, 0.09)
 Asian0.034 (0.02, 0.05)0.047 (0.02, 0.07)
Other0.014 (0.00, 0.02)0.010 (− 0.00, 0.02)
WIC x Maternal Race/Ethnicitya
 White x WICReferentReferent
 Hispanic x WIC− 0.012 (− 0.02, 0.00)− 0.010 (− 0.03, 0.01)
 Black x WIC− 0.031 (− 0.04, − 0.02)−0.025 (− 0.04, − 0.01)
 Asian x WIC−0.014 (− 0.03, 0.01)−0.022 (− 0.06, 0.01)
 Other x WIC− 0.010 (− 0.02, 0.00)−0.007 (− 0.02, 0.01)
Maternal Age (in years)
 Age ≤ 140.108 (0.02, 0.19)0.036 (−0.07, 0.14)
 Age 15–190.002 (−0.02, 0.02)− 0.002 (− 0.03, 0.02)
 Age 20–24−0.019 (− 0.03, − 0.01)−0.016 (− 0.03, − 0.00)
 Age 25–29−0.017 (− 0.03, − 0.01)−0.015 (− 0.03, 0.00)
 Age 30–34ReferentReferent
 Age 35–390.020 (0.01, 0.04)0.027 (−0.01, 0.06)
 Age 40 +0.068 (0.02, 0.12)0.063 (0.03, 0.10)
WIC x Maternal Age (in years)
 Age ≤ 14 x WIC−0.115 (− 0.20, − 0.03)−0.042 (− 0.16, 0.08)
 Age 15–19 x WIC−0.027 (− 0.06, 0.00)−0.011 (− 0.05, 0.02)
 Age 20–24 x WIC−0.007 (− 0.03, 0.01)−0.010 (− 0.03, 0.01)
 Age 25–29 x WIC−0.002 (− 0.02, 0.02)−0.000 (− 0.03, 0.03)
 Age 30–34 x WICReferentReferent
 Age 35–39 x WIC0.013 (− 0.01, 0.03)−0.015 (− 0.06, 0.03)
 Age 40 + x WIC−0.016 (− 0.08, 0.04)−0.014 (− 0.07, 0.04)
Maternal Education
 Less than H.S.0.023 (0.01, 0.04)0.040 (0.02, 0.06)
 H.S. Diploma0.017 (0.01, 0.03)0.021 (0.01, 0.03)
 Some CollegeReferentReferent
 Not Assessed;
maternal age < 20 years
0.009 (−0.00, 0.02)0.023 (0.00, 0.04)
WIC x Maternal Education
 Less than H.S. x WIC−0.007 (− 0.02, 0.01)−0.025 (− 0.05, − 0.00)
 H.S. Diploma x WIC−0.006 (− 0.01, 0.00)−0.012 (− 0.03, 0.00)
 Some College x WICReferentReferent
 Not Assessed;
maternal age < 20 years x WIC
0.004 (−0.01, 0.02)− 0.026 (− 0.03, − 0.01)
Timing of Prenatal Care Entry
 During First TrimesterReferentReferent
 After First Trimester (including no prenatal care)0.005 (−0.00, 0.01)0.017 (0.01, 0.03)
WIC x Prenatal Care
 First Trimester x WICReferentReferent
 Late x WIC−0.012 (− 0.02, − 0.01)−0.023 (− 0.03, − 0.01)
  1. Abbreviations: CI: Confidence Interval; H.S.: high school; WIC: Special Supplemental Nutrition Program for Women, Infants, and Children
  2. a “x” represents interaction between variable (e.g. maternal race/ethnicity) and WIC