Population and health: structure, rates and environment
Analyse population change and health inequalities, then evaluate explanations across physical and social conditions.
Try a fresh population question →
A-level study: check your qualification and chosen options below.
Part 1 of 4
Connect population change to its components
Population changes through births, deaths and migration, with boundary or recording changes also affecting totals. Age structure influences future births, deaths and service needs.
The demographic transition model organises broad patterns. It does not prescribe one inevitable timetable for every society.
Worked example
A fictional population has 10,000 births, 7,000 deaths, 4,000 arrivals and 2,000 departures. Net change is +5,000, assuming consistent geography and recording.
Common mistake: A birth rate and a birth count use different denominators.
Part 2 of 4
Compare health rates carefully
Health reflects environment, services, income, housing and working conditions. Exposure and the capacity to avoid or treat harm vary within places.
Age structure can confound comparisons of crude mortality. A meaningful comparison may require age-specific or standardised rates and a consistent cause definition.
Worked example
A fictional older population has more deaths per thousand despite lower age-specific risk. Applying both areas’ rates to the same reference age distribution can change the comparison.
Common mistake: A higher crude death rate does not automatically mean worse healthcare.
Part 3 of 4
Evaluate environmental and social explanations
Temperature, water quality and vector habitats influence disease pathways; housing, income and services alter exposure and responses. Identify a mechanism before interpreting an association.
Interventions such as safer water or improved housing can affect multiple outcomes. Evaluate reach and competing influences rather than equating spending with health improvement.
Worked example
In a fictional survey illness falls from 20% to 12% after safer supply: −8 points or a 40% relative decline. Other changes and sample differences still need evaluation.
Common mistake: Area-level association cannot prove the same relationship for each person.
Percentage change · Sampling methods · Source evaluation
Next: Age structure and an apparently unequal health outcome →
Part 4 of 4
Age structure and an apparently unequal health outcome
Crude death rates combine age-specific risks with population age structure. A place with more older residents can have a higher crude rate even when each age group experiences lower risk. Compare like-for-like groups before claiming that healthcare explains a contrast.
Standardisation applies age-specific rates to a common population structure. It helps comparison, but the result depends on the standard and does not identify the cause. Housing, work, exposure, prevention and access to care remain competing explanations to investigate.
Worked example
Fictional Place A has 80% younger residents with a rate of 2 deaths per 1,000 and 20% older residents with 30: weighted rate = 7.6 per 1,000. Place B has 95% younger at 3 and 5% older at 35: 4.6 per 1,000. A has the higher crude rate despite lower rates in both groups. The groups are simplified for teaching.
Common mistake: A higher crude rate does not by itself demonstrate worse healthcare.
Try a different resource
Population pyramids
These are broad age categories, not equal five-year bands. The six bars together sum to 100%.
Scroll the diagram sideways to see the full resource.
| Age group | Male (% of total) | Female (% of total) |
|---|---|---|
| 0–14 | 18 | 16 |
| 15–64 | 27 | 29 |
| 65+ | 5 | 5 |
Resource description
0–14: male 18%, female 16%; 15–64: male 27%, female 29%; 65+: male 5%, female 5%
Write an explanation
Check your answer
- Explain interacting causal pathways.
- Use suitable rates and population structures.
- Evaluate geographical scale and confounding.
- Judge interventions through reach and outcomes.
Practise and review a written answer
Case studies
Nigeria: economic change and uneven development · Cape Town’s water-security crisis
These pages provide selected evidence. Check the whole case requirement with your teacher.
Read further
- www.who.int — source or course reference
- www.aqa.org.uk — source or course reference
- www.aqa.org.uk — source or course reference
- qualifications.pearson.com — source or course reference
- www.sqa.org.uk — source or course reference
- www.ocr.org.uk — source or course reference
Measuring development · Matching evidence to a claim · Association and geographical explanations
Course links
AQA A-level Geography · Pearson Edexcel A-level Geography · Higher Geography · OCR A-level Geography
Next topics
Migration: flows, identities and uneven effects · Development: indicators, change and inequality
Selected teaching sequence with fictional worked data. The linked case records supply bounded evidence; they do not satisfy every course case requirement.
Scottish links identify reusable parts of the topic. Scottish landforms, soil, weather and disease requirements need additional course-specific teaching.