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Table 1 Proportion of area-level variance explained by the multilevel regression model for maternal and infant behavior indicators, 23 States, 2016–2018

From: US county-level estimation for maternal and infant health-related behavior indicators using pregnancy risk assessment monitoring system data, 2016–2018

Random effect Null model a Full model b   % area-level variance explained
Area-level variance SE Area-level variance SE
Breastfeeding at 8 weeks
  State 0.188 0.050 0.099 0.020 47
  County 0.063 0.005 0.031 0.004 51
Infant non-supine sleeping position c
  State 0.046 0.008 0.016 0.003 65
  1. Abbreviation SE, standard error
  2. aModel with random effects only
  3. bModel with both random and fixed effects
  4. cModel only included state-level random effect