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. Author manuscript; available in PMC: 2017 May 1.
Published in final edited form as: Am J Obstet Gynecol. 2015 Dec 2;214(5):661.e1–661.e10. doi: 10.1016/j.ajog.2015.11.030

Table 4.

Determinants of Rural Women Giving Birth in a Non-Local Hospital (N=216,076)

Adjusted Odds Ratio (95% Confidence Interval) Average Marginal Effects (%) P-value

MATERNAL CLINICAL CONDITION
Conditions Which May Require Maternal Fetal Medicine Services or Consultation 1.28 (1.22, 1.35) 4.5% <.001
Malposition, Malpresentation 1.16 (1.08, 1.24) 2.7% <.001
Multiple Gestation 1.82 (1.58, 2.1) 12.3% <.001
Pregnancy Delivered Before 37 Weeks Gestation 2.41 (2.17, 2.67) 18.7% <.001
Previous Cesarean Section 1.25 (1.17, 1.34) 4.2% <.001

MATERNAL CHARACTERISTICS
Age
    Age ≤20 0.82 (0.74, 0.9) −3.5% <.001
    21≤Age≤25 0.91 (0.86, 0.97) −1.6% <.001
    26≤Age≤30 Ref - -
    31≤Age≤35 1.04 (1.01, 1.07) 0.8% <.001
    Age≥36 1.12 (1.04, 1.21) 2.2% <.001

Primary Payer
    Medicaid 0.76 (0.68, 0.86) −4.9% <.001
    Private Ref - -
    Self 0.96 (0.77, 1.18) −0.8% 0.681
    Other 0.91 (0.82, 1.02) −1.8% 0.093

Race/Ethnicity
    White Ref - -
    Black 0.67 (0.60, 0.76) −6.5% <.001
    Hispanic 0.70 (0.56, 0.88) −5.9% <.001
    Native American, Asian, Other 1.14 (0.84, 1.57) 2.6% 0.401

Patient Residence Rurality
    Micropolitan area Ref - -
    Noncore adjacent to a metro area 2.29 (1.77, 2.96) 15.9% <.001
    Noncore not adjacent to a metro area 1.88 (1.13, 3.16) 11.6% 0.016

LOCAL HOSPITAL CHARACTERISTICS

Neonatal Care Capacity
    Any Neonatal Intensive Care Units Ref - -
    Neonatal Intermediate Care Units Only 1.77 (1.25, 2.51) 9.4% <.001
    No NICU or NINT 1.94 (1.64, 2.31) 11.3% <.001

Local Hospital(s) with:
Accreditation 0.92 (0.67, 1.26) −1.5% 0.602
System Affiliation 1.02 (0.81, 1.3) 0.4% 0.859

Note: Model also controlled for year of birth and maternal residence of state. Average marginal effects demonstrate a change in the predicted probability of non-local delivery for an average rural woman in one category relative to the referents.