Define POPULATION EXPLOSION. What are demographic trends in India. What measures measures do you suggest for the control of population explosion.- spm from park textbook

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Population Explosion, Demographic Trends in India & Control Measures

From Park's Textbook of Preventive and Social Medicine

PART 1: POPULATION EXPLOSION - Definition

Demography is the scientific study of human populations, focusing on: (a) changes in population size, (b) composition of population, and (c) distribution in space. It deals with five demographic processes: fertility, mortality, marriage, migration and social mobility.

Definition of Population Explosion

Population explosion refers to the rapid, uncontrolled increase in population size, driven primarily by a sustained high birth rate alongside a sharply declining death rate. It is characterized by an "explosive" annual growth rate of 2.0-2.5% or more, at which a population doubles in size in just 28-35 years.

Park classifies population growth rates as follows:

Rating	Annual Growth Rate (%)	Years to Double
Stationary	No growth	-
Slow	< 0.5	> 139
Moderate	0.5-1.0	139-70
Rapid	1.0-1.5	70-47
Very rapid	1.5-2.0	47-35
"Explosive"	2.0-2.5	35-28

The Demographic Cycle (5 Stages)

Park describes a 5-stage demographic cycle through which nations pass:

First Stage - High Stationary: High birth rate AND high death rate cancel each other; population remains stationary. India was in this stage until 1920.
Second Stage - Early Expanding: Death rate begins to decline while birth rate remains high; population starts to grow. Many South Asian and African countries are in this phase.
Third Stage - Late Expanding: Death rate declines further; birth rate also begins to fall but births still exceed deaths; population continues to grow. India entered this phase.
Fourth Stage - Low Stationary: Low birth rate AND low death rate; population becomes stationary. Zero population growth - seen in Austria, UK, Scandinavia.
Fifth Stage - Declining: Birth rate falls below death rate; population declines. Examples: Germany, Hungary.

Causes of Population Explosion

The key determinants are:

High fertility: Universality of marriage, low age at marriage, low literacy, poor standard of living, limited use of contraceptives, traditional ways of life
Declining mortality: Improved health services, immunization, control of infectious diseases, better nutrition
Population momentum: Like a railway train, once in motion, age distribution, marriage customs and cultural factors make it hard to slow down

PART 2: DEMOGRAPHIC TRENDS IN INDIA

2.1 Population Size and Growth

India is the second most populous country in the world (as of 2020 mid-year: 1,400.2 million), supporting 17.5% of the world's population on only 2.4% of the world's land area.

Population growth in India (Census data):

Year	Population (million)	Annual Growth Rate (%)	Decadal Growth (%)
1901	238.4	-	-
1921	251.3	-0.03	-0.31 (Big Divide)
1951	361.1	1.25	13.31
1961	439.2	1.96	21.64
1971	548.2	2.20	24.80
1981	683.3	2.22	24.66
1991	846.4	2.16	23.87
2001	1,028.6	1.70	21.52
2011	1,210.1	1.64	17.64

Key point: 1921 is called the "Big Divide" - since that year, the absolute number of people added each decade has been on the increase. India's population numbered 238 million in 1901, doubled in 60 years to 439 million (1961), then doubled again in only 30 years to 846 million (1991). It crossed 1 billion on 11 May 2000. It is currently increasing at the rate of 16 million each year and is projected to reach 1.53 billion by 2050, when it will surpass China.

Most populous states (2020): Uttar Pradesh (231.4 million, 16.7%), Maharashtra (128.7 million), Bihar (108.4 million) - these 10 states account for ~71% of India's population.

2.2 Birth Rate

India's crude birth rate fell from 31 (1990) to 20 (mid-2020) per 1000 population. Despite this decline, the birth rate remains higher than in developed countries (UK: 11, Japan: 7, Singapore: 9).

2.3 Death Rate

India's crude death rate declined from 11 (1990) to 6 (mid-2020) per 1000 population. This dramatic fall is attributed to improved maternal and child health services, immunization, control of infectious diseases and better nutrition.

2.4 Growth Rate

India's current annual growth rate is approximately 1.64% (2001-2011 period). At this rate, the population doubles in about 43 years.

2.5 Sex Ratio

India's sex ratio (females per 1000 males) has shown a declining trend:

Year	Females per 1000 Males
1901	972
1941	945
1971	930
2001	933
2011	943

The sex ratio at birth (2016-2018) for India overall is 899 females per 1000 males, reflecting the problem of sex-selective abortion. States with the worst sex ratios at birth include Haryana (843), Delhi (844), and Uttarakhand (840).

2.6 Age Structure

India has a young population - a major demographic feature. A young age structure fuels population momentum as large cohorts enter reproductive age. The dependency ratio (proportion of young + elderly dependent on working-age population) is relatively high.

2.7 Life Expectancy

Life expectancy at birth in India (2020): 68 years (male) and 70 years (female). This compares unfavourably with developed countries (Japan: 81/87, UK: 79/83) but shows significant improvement over historical values.

2.8 Literacy

The effective literacy rate in Census 2011 was 74.04% overall (male: 82.14%, female: 65.46%). Total number of illiterates declined from 304.1 million (2001) to 272.9 million (2011). Kerala tops literacy at 93.91%, while Bihar and Rajasthan remain at the bottom.

2.9 Rural-Urban Distribution

Continuous migration from rural to urban areas constitutes a social crisis in India. The urban population has grown significantly due to employment opportunities and better social services. As of 2011 census, India had 640,867 villages; by 2020, this increased to 664,369.

2.10 Total Fertility Rate (TFR)

India's TFR fell dramatically from 3.7 (1994) to 1.8 (2020). However, wide inter-state variations exist:

Southern states (Kerala, Tamil Nadu, Karnataka, Andhra Pradesh): TFR at or below replacement level
BIMARU states (Bihar, MP, Rajasthan, Uttar Pradesh): TFR significantly above replacement level

NFHS-4 (2015-16) data shows TFR varies by:

Residence: Urban 1.75 vs Rural 2.41
Education: No education 3.06 vs College educated < 2.0
Religion: Muslims 2.61, Hindus 2.13, Christians 1.99

2.11 Factors Affecting Fertility in India

Age at marriage: Earlier marriage = longer exposure to pregnancy risk
Education: Inverse relationship with fertility - educated women have fewer children
Employment of women: Working women tend to have fewer children
Standard of living: Economic development is "the best contraceptive" (Bucharest Conference, 1974)
Urbanization: Urban populations have lower TFR (1.75 vs rural 2.41)
Caste and religion: Muslims (TFR 2.61) > Hindus (2.13) > Christians (1.99)
Nutrition: Well-fed societies have low fertility; poorly fed have high fertility
Family planning: A key factor in fertility reduction when programmes are accessible

PART 3: MEASURES FOR CONTROL OF POPULATION EXPLOSION

Park outlines a comprehensive approach under the slogan: "Delay the first, postpone the second and prevent the third."

The measures can be grouped as:

A. FAMILY PLANNING PROGRAMME

Definition (WHO, 1971): "A way of thinking and living adopted voluntarily, upon the basis of knowledge, attitudes and responsible decisions by individuals and couples, in order to promote health and welfare of the family group and contribute effectively to the social development of a country."

Objectives of family planning:

Avoid unwanted births
Bring about wanted births
Regulate intervals between pregnancies
Control timing of births in relation to parents' age
Determine the number of children in the family

Family planning is a basic human right - recognized by UN Conference at Teheran (1968) and Bucharest Conference (1974).

Scope (WHO Expert Committee, 1970): Beyond birth control to include proper spacing and limitation of births, advice on sterility, education for parenthood, sex education, screening for reproductive cancers, genetic counselling, premarital consultation, marriage counselling, and adoption services.

B. CONTRACEPTIVE METHODS

The "cafeteria choice" approach - offering all methods for individual selection:

I. Spacing Methods

Barrier Methods
- Physical: Condom (NIRODH), diaphragm, cervical cap
- Chemical: Spermicides (creams, jellies, foams)
- Combined: Condom + spermicide
Intra-uterine devices (IUDs): Copper-T, Multiload
Hormonal methods: Combined oral contraceptive pills, progestogen-only pills, injectables (DMPA), implants
Post-conceptional methods: Emergency contraception, MTP
Miscellaneous: LAM (Lactational Amenorrhoea Method), periodic abstinence (calendar method, rhythm method)

II. Terminal Methods

Male sterilization (Vasectomy): Simple, safe, permanent
Female sterilization (Tubectomy/Laparoscopic sterilization): Most widely used terminal method in India

C. SOCIO-ECONOMIC AND EDUCATIONAL MEASURES

Female education: Strongly inversely correlated with fertility. Educated women marry later, use contraception more, and have smaller family norms
Raising the age of marriage: Legal minimum: 18 years for women, 21 years for men (Child Marriage Restraint Act). Each year's delay in marriage reduces fertility
Women's empowerment: Employment and economic independence for women reduces fertility
Raising the standard of living: Economic development reduces the "value" of children as economic assets; the Bucharest Conference (1974) emphasized that "economic development is the best contraceptive"
Urbanization and industrialization: Urban populations have lower fertility due to changed lifestyle, better education, and employment opportunities

D. HEALTH SERVICES APPROACH

MCH (Maternal and Child Health) services: Reducing infant mortality reduces desire for more children (the "child survival hypothesis")
Antenatal and postnatal care: Promotes spacing of births
Nutrition programmes: Improved nutrition indirectly reduces fertility
Immunization: Reducing child mortality reduces replacement fertility

E. NATIONAL POPULATION POLICY

India launched the National Family Planning Programme in 1952 - the first country in the world to do so. Key features over time:

The two-child norm with the demographic goal of NRR = 1 (Net Reproduction Rate = 1 means replacement-level fertility)
The Target Free Approach (TFA) replaced target-based approach in 1996
National Population Policy 2000 set goals including TFR of 2.1 by 2010

F. LEGISLATION

Child Marriage Restraint Act
Dowry Prohibition Act
Maternity Benefit Act
Equal Remuneration Act
PCPNDT Act (Pre-Conception and Pre-Natal Diagnostic Techniques Act) - to combat sex-selective abortion

G. INFORMATION, EDUCATION AND COMMUNICATION (IEC)

Mass media campaigns promoting small family norm
School health education
Community-based health education by ANMs, ASHAs, AWWs
Behaviour Change Communication (BCC)

Summary Table: Measures for Population Control

Category	Key Measure
Contraception	All spacing + terminal methods (cafeteria approach)
Legal	Raise marriage age, PCPNDT Act
Educational	Female literacy, sex education
Economic	Women's employment, raise standard of living
Health services	Reduce IMR (child survival hypothesis), MCH
Policy	National Population Policy, two-child norm, NRR=1
IEC	Mass media, community education, BCC

Source: Park's Textbook of Preventive and Social Medicine, Chapter 10 - Demography and Family Planning

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