Race, Socioeconomic Status, and Age: Exploring Intersections in Preterm Birth Disparities among Teen Mothers

Table 3

PTB analyses for race, income, and maternal age multilevel models [OR (95% CI)].

	Model 1: race alone	Model 2: income alone	Model 3: age alone	Model 4: additive model
Intercept	0.11 (0.10, 0.11)	0.10 (0.10, 0.11)	0.11 (0.10, 0.11)	0.11 (0.10, 0.11)
African-American (AA)	1.38 (1.21, 1.56)			1.36 (1.20, 1.56)
White (referent group)	—			—
Low income		1.09 (0.95, 1.27)		1.10 (0.96, 1.26)
Middle income		1.02 (0.90, 1.15)		1.02 (0.91, 1.14)
High income (referent group)		—		—
Age <17			1.15 (0.98, 1.34)	1.15 (0.99, 1.32)
Age 17–19 (referent group)			—	—
Random variance
Intercept (SD)	0.03 (0.17)	0.03 (0.18)	0.03 (0.18)	0.03 (0.17)
Statistics comparisons
−2 log likelihood	46126.98	46598.64	46317.62	45586.18

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