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Skewed Sex Ratios at Birth and Future MarriageSqueeze in China , 2005–2100

- - - - mostly through a gradual increase in the age difference between spouses caused either by earlier female marriages or bydelayed male marriages
    - - women have delayed their marriages in many East Asiancountries and metropolitan areas
    - - it presents serious The limitations of the appraisal of the actual impact of sustained sex imbalances.
        
        weighted sex ratios
        
        presents serious limitations for the appraisal of theactual impact of sustained sex imbalances.
    - - The authors predict the future population through the UN's population parameters.
        
        the SRB starts decreasingimimate after after 2005
        
        birth imbalances would havevanished by 2020. Both scenarios are deliberately extreme
    - - the number of annual births tends toincrease during the first phase of the demographic transition
      - but decreases later afterprolonged fertility decline.
      - the number of births started declining in the 1990s