"Additional Table 2: Covariate-Adjusted B-Spline Odds Ratios and 95% Confidence Interval for Relationships Between Rurality and 1991-2010 Alabama Adverse Birth Outcomes, by Year",,,,,,
,,Preterm Birth,,,Low Birth Weight,
,1991,2006,2010,1991,2005,2010
RUCA,,,,,,
   Small Town,"0.90 (0.79, 1.03)","1.03 (0.96, 1.10)","1.27 (1.12, 1.45)","0.94 (0.82, 1.09)","0.97 (0.91, 1.04)","1.12 (0.98, 1.28)"
   Large Town,Reference,Reference,Reference,Reference,Reference,Reference
   Urban,"1.07 (0.96, 1.19)","1.04 (0.99, 1.10)","1.16 (1.04, 1.29)","0.95 (0.85, 1.07)","1.00 (0.94, 1.06)","0.98 (0.88, 1.10)"
Population density,,,,,,
   1st Tertile,"0.92 (0.84, 1.01)","1.04 (1.00, 1.09)","1.00 (0.92, 1.08)","0.99 (0.90, 1.09)","1.01 (0.97, 1.06)","1.01 (0.92, 1.10)"
   2nd Tertile,Reference,Reference,Reference,Reference,Reference,Reference
   3rd Tertile,"1.07 (0.98, 1.16)","1.09 (1.04, 1.13)","1.05 (0.97, 1.14)","0.96 (0.88, 106)","1.09 (1.02, 1.11)","1.03 (0.94, 1.12)"
"Abbreviations: RUCA, Rural-Urban Commuting Area Codes",,,,,,
"Models include year, parity, payment method, mother’s age, education, and race.",,,,,,