Table 1.

Coefficients and standard errors (SE) for transfer functions predicting the risk ratio of periviable births to all Latina women, as well as to foreign and native-born Latina women, compared to non-Latina white women in 87 monthly conception cohorts (Janauary 2009 through March 2016).

	All Latina women		Foreign-born Latina women		Native-born Latina women
Predictor	Coefficient	SE	Coefficient	SE	Coefficient	SE
Constant	1.451**	0.037	1.359**	0.034	1.338**	0.065
Month of year
February	0.018	0.053	−0.030	0.048	−0.031	0.064
March	−0.035	0.045	−0.062	0.048	−0.071	0.061
April	−0.152**	0.055	−0.132**	0.050	−0.156**	0.072
May	0.002	0.055	0.017	0.050	−0.003	0.067
June	0.048	0.055	−0.025	0.050	−0.051	0.076
July	−0.071	0.055	−0.054	0.050	−0.060	0.074
August	0.070	0.055	0.023	0.050	0.019	0.076
September	0.028	0.055	−0.007	0.050	−0.009	0.068
October	0.066	0.055	0.036	0.050	0.033	0.072
November	−0.024	0.048	−0.059	0.050	−0.043	0.064
December	−0.023	0.055	0.031	0.050	0.010	0.064
Box-Jenkins Parameters	MA(2) = −0.298**	0.104	AR(12)=−0.409**	0.121	MA(8)= 0.239** AR(1) = 0.313** AR(2) = 0.101**	0.115 0.099 0.100

^*p < .05, 2-tailed test;

^**p < .01, 2-tailed test.