OFFICIAL STATISTICS SPECIALLY DESIGNED FOR INDIAN STATISTICAL SERVICE (ISS) AND OTHER GOVERNMENT & PRIVATE SECTOR STATISTICAL EXAMINATIONS
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Health statistics combine demographic, epidemiological and administrative measures. The same event can produce very different indicators depending on the population at risk, age structure and reference period. This makes health statistics an excellent ISS topic for testing definitions and rate construction.
1. Major domains
Health statistics include mortality, morbidity, fertility-related measures, health service utilisation, infrastructure, personnel and expenditure. Each domain has its own definitions and appropriate denominators.
2. Mortality measures
Mortality rates can be crude or cause-specific and may be expressed for a particular age group or population. Age structure strongly affects crude comparisons, so standardisation may be required when comparing populations.
3. Morbidity and incidence
Incidence generally refers to new cases occurring during a specified period, while prevalence refers to existing cases at a specified point or over a period. The distinction is fundamental in statistical interpretation.
4. Health infrastructure
Counts of facilities, beds and health personnel are supply-side indicators. Ratios such as beds per population require a clearly defined reference population and geographic coverage.
5. Data sources
Health statistics may use civil registration, sample systems, surveys, hospital records, administrative systems and specialised studies. Source differences can affect coverage and comparability.
6. Quality and interpretation
A health indicator should be accompanied by its numerator, denominator, time period, population coverage and method. Apparent changes may reflect real events, reporting changes or methodological revisions.
Incidence
New cases occurring during a specified period.
Prevalence
Existing cases at a point or during a specified period.
Rate
A measure involving a defined numerator, denominator and time/reference population.
ISS Exam Focus
For official-statistics questions, never give a number without its definition. State the statistical unit, reference period, coverage, numerator and denominator, and distinguish a level, rate, ratio, stock or flow.
Exam tip
In a numerical question, write the formula first, substitute the data second, calculate third, and finish with the correct unit. In a descriptive question, organise the answer under definition, methodology, data source, quality and interpretation.
Three important questions on this topic
Try each one on your own first, then tap the answer.
Differentiate incidence and prevalence.
Show answer
Incidence concerns new cases during a specified period; prevalence concerns existing cases at a specified point or period.
A population records 360 new cases of a disease during a year, with an average population of 120,000. Find the incidence per 1,000 population.
Show answer
Incidence = 360/120,000 × 1,000 = 3 per 1,000 population.
Why is age standardisation important when comparing mortality between populations?
Show answer
Explain how different age structures can produce different crude mortality rates even when age-specific risks are similar. Describe direct and indirect standardisation conceptually and explain the need for a standard population or appropriate reference.
Key takeaways
- New cases occurring during a specified period.
- Existing cases at a point or during a specified period.
- A measure involving a defined numerator, denominator and time/reference population.
- Always state the population, reference period, unit, numerator and denominator before interpreting an official statistic.
Everything on Official Statistics, in one book
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- Indian official statistical system: MoSPI, NSO, NSC and the data they produce
- National accounts, GDP, IIP, price indices and labour statistics
- NSS surveys, sampling designs and data quality concepts
- Written specially for the ISS exam, and useful for other government and private sector statistical exams
- Concept-focused notes to revise quickly before the exam
Official Statistics for ISS and other Government & Private Sector Statistical Examinations