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# Age Structure Diagrams and Population Growth Age structure diagrams help predict future population growth. Different shapes correspond to different growth patterns: * **Population pyramid:** Rapid growth, common for developing countries * **Even age distribution:** Stable population size, t...

# Age Structure Diagrams and Population Growth Age structure diagrams help predict future population growth. Different shapes correspond to different growth patterns: * **Population pyramid:** Rapid growth, common for developing countries * **Even age distribution:** Stable population size, typical of many developed countries * **Inverted pyramid:** Declining population size, common for some developed countries # Equations for Population Dynamics These equations help calculate various population parameters: * **Crude Birth Rate (CBR):** CBR (births per 1,000 people) = (# Births/Total pop.) x 1000 * **Crude Death Rate (CDR):** CDR (deaths per 1,000 people) = (#Deaths/Total pop.) x 1000 * **Birth Rate (%):** Birth rate (%) = (# Births/Total pop.) x 100% * **Death Rate (%):** Death rate (%) = (#Deaths/Total pop.) x 100% * **Growth Rate (%) - Given Numbers:** Growth rate (%) = [(# Births - #Deaths + # Immigrants - # Emigrants)/Total pop.] x 100% * **Growth Rate (%) - Given Crude Rates:** Growth rate (%) = (CBR - CDR + crude immigration - crude emigration)/10 * **Rule of 70:** Doubling Time Doubling time (in years) = 70 ÷ growth rate as a % * **Net Migration:** Net migration = Immigration - Emigration (in either numbers or crude rates) # Module 18: Human Population Dynamics This module explores factors influencing population parameters. Important socioeconomic factors include: * Access to quality healthcare, including prenatal care * Access to healthy food and clean water * Education and freedom for people with uteruses * Access to family planning services and contraception * Cultural norms and expectations