Table 2

Coefficients for model of the fetal death sex ratio (i.e., male/female) in the United States (less California) for September, October, and November 2001. Standard errors appear in parentheses.

Predictor

Initial model

Final model


Constant

1.143** (.0036)

1.143** (.0035)

ARIMA parameters

AR at 12

-.4823** (.1132)

-.4713** (.1103)

AR at 3

-.2558* (.1188)

-.2657* (.1164)

September 11 variable lagged at:

September 2001

.1279** (.0466)

.1232** (.0468)

October 2001

.0196 (.0463)

November 2001

.0076 (.0462)


*

    p
< 0.05, 2-tailed test

**

    p
< 0.01, 2-tailed test

Bruckner et al. BMC Public Health 2010 10:273   doi:10.1186/1471-2458-10-273

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