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This is the complete lecture note for COM302 Introduction to Demography and Vital Statistics. You can read it online below, open it in the full viewer, or download the PDF for offline study. It pairs with the course's video lectures, so you can read and watch together.
la-NET | ONLINE LEARNING VIDEO PLATFORM FOR POST-SECONDARY & HIGHER INSTITUTION STUDENTS
la-NET | ONLINE LEARNING VIDEO PLATFORM FOR POST-SECONDARY & HIGHER INSTITUTION STUDENTS Course code: COM 302 Course title: Introduction to Demography and Vital Statistics Course credit load: 2 Units Series 1: Sources of Population Data • Part 1.1: Introduction to Demography o Sub Part 1.1.1: Definition and scope of demography o Sub Part 1.1.2: Importance of demography in public health o Sub Part 1.1.3: Basic demographic concepts • Part 1.2: The National Population Census o Sub Part 1.2.1: Definition, purpose, and history of the census in Nigeria o Sub Part 1.2.2: Methods and organisation of a census o Sub Part 1.2.3: Limitations and errors in census data • Part 1.3: Other Sources of Population Data o Sub Part 1.3.1: Civil registration systems o Sub Part 1.3.2: Sample surveys and demographic surveys o Sub Part 1.3.3: Administrative records and population registers • Part 1.4: Quality, Coverage, and Use of Population Data o Sub Part 1.4.1: Completeness and accuracy of population data o Sub Part 1.4.2: Evaluating and adjusting population data o Sub Part 1.4.3: Uses of population data in health planning Introduction
la-NET | ONLINE LEARNING VIDEO PLATFORM FOR POST-SECONDARY & HIGHER INSTITUTION STUDENTS Every meaningful statement about population health rests on data. Whether a government is planning how many hospitals to build, where to deploy community health workers, or how to respond to an outbreak, it needs reliable information about how many people live where, how old they are, and how the population is changing. Demography is the science that provides this foundation, and the quality of demographic data determines the quality of the health decisions made from it. The aim of this Series is to introduce you to the science of demography, to identify and evaluate the main sources from which population data are obtained, and to examine how the quality of that data affects its use in public health planning. We shall commence by defining demography and its core concepts. Next, we will examine the national population census as the primary source of population data in Nigeria. Moving on, we will survey the other major sources including civil registration, surveys, and administrative records. Finally, we will close by examining how the quality and completeness of population data are assessed and how the data are used in health planning. Series Learning Outcomes Upon completing this Series, you should be able to: • SLO 1.1 define demography and explain its scope and importance in public health, • SLO 1.2 describe the basic demographic concepts of population, cohort, and demographic transition, • SLO 1.3 define a national population census and describe its purposes, methods, and history in Nigeria, • SLO 1.4 identify and describe the limitations and common errors in census data, • SLO 1.5 describe civil registration, sample surveys, and administrative records as sources of population data, • SLO 1.6 evaluate the completeness and accuracy of population data, and • SLO 1.7 explain how population data are used in health system planning and resource allocation.
la-NET | ONLINE LEARNING VIDEO PLATFORM FOR POST-SECONDARY & HIGHER INSTITUTION STUDENTS 1.1 Introduction to Demography 1.1.1 Definition and scope of demography Demography is the scientific study of human populations, including their size, structure, distribution, and the processes that change them over time: fertility (births), mortality (deaths), and migration. The word derives from the Greek demos (people) and graphos (writing or description). Demography is both a descriptive and an analytical discipline: it describes the current state of a population and analyses the forces that drive change, generating the evidence base for policy and planning decisions at every level of government. The scope of demography spans formal demography, which focuses on mathematical and statistical analysis of population data, and social demography, which examines the social, economic, and political determinants and consequences of demographic change. For health professionals, demography provides the population denominator for all health rates and indicators, identifies the groups at greatest risk of disease or death, and generates the projections on which health workforce planning, facility planning, and programme budgeting depend. Fill in the blank: Demography is the scientific study of human populations, including their size, structure, distribution, and the three processes of fertility, __________ , and migration that drive change over time. 1.1.2 Importance of demography in public health Public health cannot function without demographic data. Every epidemiological rate, from the infant mortality rate to the prevalence of hypertension, requires a population denominator. Without knowing how many people of what age and sex live in an area, it is impossible to calculate rates, set targets, or evaluate whether interventions are working. Demographic data also identify at-risk groups: knowing that a district has a rapidly growing adolescent population, for example, directs resources toward reproductive health and adolescent services.
la-NET | ONLINE LEARNING VIDEO PLATFORM FOR POST-SECONDARY & HIGHER INSTITUTION STUDENTS Demographic projections are the basis of health workforce planning and facility planning. A district health plan based on the current population without accounting for projected growth may result in facilities that are inadequate within five years of opening. In Nigeria, where population growth rates have been among the highest in the world, demographic projections are critical for anticipating the health needs of a population that may double in size within a generation. Decision-makers who ignore demography plan for the population they imagine rather than the population that exists or will exist. Fill in the blank: Every epidemiological rate requires a population __________ ; without knowing how many people of what age and sex live in an area, rates cannot be calculated and interventions cannot be evaluated. 1.1.3 Basic demographic concepts Several fundamental concepts provide the vocabulary of demography. A population is a defined group of people sharing a geographic or other characteristic at a specified time. A cohort is a group of individuals who share a common experience in the same time period, such as all persons born in the same year (a birth cohort) or all persons who married in the same year. A period measure reflects the experience of the whole population at a given point in time, while a cohort measure follows a specific group over time. The demographic transition describes the shift that occurs as countries develop, from high fertility and high mortality (stable but stagnant population) through a period of falling mortality with continued high fertility (rapid population growth) to low fertility and low mortality (stable but ageing population). Nigeria is in the middle phase: mortality, particularly child mortality, has fallen, but fertility remains high, producing rapid population growth. Understanding where a country sits in the demographic transition explains much about its current health challenges and future demographic trajectory. Fill in the blank: The __________ transition describes the shift from high fertility and high mortality through rapid growth to low fertility and low mortality as countries develop; Nigeria currently sits in the phase of falling mortality with persistently high fertility.
la-NET | ONLINE LEARNING VIDEO PLATFORM FOR POST-SECONDARY & HIGHER INSTITUTION STUDENTS Figure 1.1: The demographic transition model Pilot questions 1.1 1. Define demography. 2. Name the three processes that change population size. 3. Distinguish between formal demography and social demography. 4. Why does public health depend on demographic data? 5. Define the demographic transition and state which phase Nigeria currently occupies.
la-NET | ONLINE LEARNING VIDEO PLATFORM FOR POST-SECONDARY & HIGHER INSTITUTION STUDENTS 1.2 The National Population Census 1.2.1 Definition, purpose, and history of the census in Nigeria A national population census is the total process of collecting, compiling, evaluating, analysing, and publishing demographic, economic, and social data pertaining to all persons in a country at a specified time. It is distinguished from a sample survey by its aim of universal coverage: every person present in the country on census night should be enumerated. The census serves multiple purposes: it provides the population denominator for all national statistics, determines the distribution of electoral seats and government revenue, guides infrastructure and social service planning, and provides baseline data for intercensal estimates and projections. Nigeria has conducted several national censuses since independence, with counts in 1963, 1973 (annulled), 1991, and 2006; the most recent census was conducted in 2023 under the National Population Commission (NPC). Nigerian census history has been politically contentious because census results determine the allocation of federal revenues and political representation among states and ethnic groups. The 1973 census was annulled due to irregularities; the 1991 and 2006 censuses were also disputed. These political dimensions of the census are a uniquely Nigerian challenge that affects the reliability and acceptance of census data. Fill in the blank: A national population __________ aims to enumerate every person present in a country at a specified time and provides the population denominator for all national statistics and the basis for revenue and political seat allocation. 1.2.2 Methods and organisation of a census Two principal methods are used to conduct a census. The de facto method counts people where they are physically present on census night, regardless of their usual
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