TABLE 7.

Age-Stratified Multivariate Poisson Regression Models Exploring the Relationship Between Census Tract–Level Socioeconomic Indicators and Femur Fractures

Age, y“Best” ModelRR (95% CI)P Value
0–3Gender (male vs female)2.10 (1.63–2.64)<.0001
Family income, quartiles
    <$40 9120.65 (0.39–1.07).090
    $40 912–$52 9710.57 (0.36–0.89).015
    $52 972–$70 3280.56 (0.37–0.85).006
    >$70 3281.00
Race/ethnicity of children in the tract
    >31% Hispanic2.91 (1.67–5.10).0002
    15–31% Hispanic2.07 (1.26–3.44).004
    7.7–14.9% Hispanic1.62 (1.05–2.51).030
    <7.7% Hispanic1.00
Single motherhood (per 10% increase)1.14 (1.01–1.28).039
Household crowding
    <94.1% noncrowded households*1.02 (0.62–1.69).919
    94.1–97.0% noncrowded households1.62 (1.03–2.52).034
    97.1–98.6% noncrowded households1.43 (0.94–2.18).093
    >98.6% noncrowded households1.00
4–12Gender (male vs female)2.00 (1.61–2.48)<.0001
Single-family housing
    <60.1%1.37 (0.97–1.94).072
    60.1–75.0%1.28 (0.92–1.79).15
    75.1–88.7%1.47 (1.07–2.00).016
    >88.7%1.00
Household crowding
    <94.1% noncrowded households1.70 (1.2–2.42).003
    94.1–97.0% noncrowded households1.54 (1.08–2.18).015
    97.1–98.6% noncrowded households1.53 (1.09–2.15).017
    >98.6% noncrowded households1.00
13–17Gender (male vs female)2.77 (2.18–3.52)<.0001
Rural residence1.15 (1.09–1.22)<.0001
Race/ethnicity of children in the tract
    >31% Hispanic1.39 (1.03–1.86).030
    15–31% Hispanic1.14 (.85–1.54).380
    7.7–14.9% Hispanic1.01 (0.75–1.36).960
    <7.7% Hispanic1.00
  • All variables simultaneously in the most-parsimonious model for each age group.

  • * Percentage of households with <1 person per room.