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Table 3 Coefficients for initial and final model of the secondary sex ratio in the United States (less California and New York City) for November 2001, December 2001 and January 2002.

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

Predictor Initial model Final model
Constant 1.048* (.0005) 1.048* (.0004)
ARIMA parameters
   AR at 1 .2403* (.1136) .2487* (.1108)
   AR at 6 -.2294* (.1128) -.2353* (.1097)
   MA at 16 .2986* (.1249) .2933* (.1243)
September 11 variable lagged at:
   November 2001 -.0019 (.0038)  
   December 2001 -.0079* (.0039) -.0074* (.0036)
   January 2002 -.00005 (.0038)  
  1. Standard errors appear in parentheses.
  2. * p < 0.05, 2-tailed test