Are smart Jewish women having fewer kids? I looked at GSS data to see if high-IQ Jewish women are having fewer children than less intelligent Jews. Here are the mean number of children for women ages 40 and over for two time periods.
Mean number of children
High IQ 2.03
Low IQ 1.97
High IQ 1.88
Low IQ 2.10
The total fertility rate has slipped a bit among smart Jewish women, while it is now a bit higher for less intelligent woman. So the trend over the past four decades has been slightly dysgenic.
UPDATE: To focus on recent trends, we need a much narrower age range--let's look at women ages 40-59. This reduces our N quite a bit, but these are the tradeoffs.
Mean number of children--Jewish women ages 40-59
High IQ 2.24
Low IQ 2.44
High IQ 1.42
Low IQ 2.42
The picture that emerges when we remove older cohorts from the analysis is much more dramatic. These numbers show a much sharper dysgenic trend. The total fertility rate for smart Jewish women has dropped significantly over the past four decades, while the rate for dull women has held steady.
The mean IQ of American Jews will decline if this continues over enough generations.