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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.

From: Male fetal loss in the U.S. following the terrorist attacks of September 11, 2001

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)  
  1. * p < 0.05, 2-tailed test
  2. ** p < 0.01, 2-tailed test