I.B. ESS Topic 8. Human Systems and Resource Use
Chamberlain College Of Nursing
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Exam (elaborations)
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Crude Birth Rate (CBR) 
Number of births per thousand individuals in a population per year (population size/number of births x 
1000) 
Crude Death Rate (CDR) 
Number of deaths per thousand individuals in a population per year (population size/number of deaths x 
1000) 
Natural Increase Rate (NIR) 
Rate of human growth expressed as a percentage change per year (crude birth rate - crude death 
rate/10) 
Doubling Time (DT) 
Time in years that it takes for a population to double in size