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Table 4 Stepwise analysis of the effect of paternal age on cases, controls

From: Advanced paternal age is a risk factor for schizophrenia in Iranians

   B Standard error Significance Exp(B) 95% CI for Exp(B)
       Lower Upper
Step 1 Birth rank 0.313 0.131 0.017 1.368 1.058 1.769
  Constant -0.642 0.285 0.025 0.526   
Step 2 Birth rank 0.237 0.142 0.096 1.268 0.959 1.676
  Family history 0.481 0.263 0.067 1.618 0.967 2.707
  Maternal age 0.387 0.377 0.304 1.473 0.704 3.083
  Constant -0.599 0.297 0.044 0.550   
Step 3 Birth rank -0.115 0.169 0.496 0.891 0.640 1.241
  Family history 0.444 0.268 0.098 1.559 0.922 2.638
  Maternal age -0.374 0.431 0.386 0.688 0.296 1.602
  Paternal age 1.329 0.336 0.000 3.778 1.955 7.304
  Constant -0.123 0.321 0.703 0.885