Abstract
Objectives To determine the extent to which non-Latina White and African-American mother's gestational age is associated with extremely early (<30 weeks), modestly early (30-33 weeks), and late (34-36 weeks) infant preterm birth (ptb) rates. methods race-specific stratified and multivariable logistic regression analyses were performed on the illinois transgenerational birth file of non-latino white and african-american infants (born 1989-1991) and their mothers (born 1956-1976). results white mothers (n =" 184)" born at><30 weeks had a greater extremely early infant ptb rate than white mothers (n =" 131,980)" born at term: 1.6 versus 0.5%, respectively; rr =" 3.6" (1.2, 11.0). african-american mothers (n =" 269)" born at><30 weeks had a greater extremely early infant ptb rate than african-american mothers (n =" 34,885)" born at term: 4.1 versus 2.1%, respectively; rr =" 2.0" (1.1, 3.6). in logistic regression models the adjusted (controlling for maternal age, education, parity, prenatal care, marital status, and cigarette smoking) or of extremely early ptb for white and african-american mothers born><30 (compared to ≥37) weeks equaled 4.0 (1.2, 12.6) and 2.3 (1.2, 4.3), respectively. the adjusted or of modestly early ptb for white and african-american mothers born 30-33 (compared to ≥37) weeks equaled 1.6 (1.0, 2.5) and 1.3 (0.9, 1.7), respectively. the adjusted or of late ptb for white and african-american mothers born 34-36 (compared to ≥37) weeks equaled 1.2 (1.0, 1.3) and 1.1 (1.0, 1.2), respectively. conclusions a generational association of extremely early, but not modestly early or late, ptb exists among non-latino whites and african-americans.>
