NFHS-6 Explained: Why 30 Key Indicators on Anaemia, Sex Ratio & Cancer Screening Are Missing, and What "Data Harmonisation" Means

• Definition and nature: The National Family Health Survey is a large-scale, multi-round household survey conducted across a representative sample of households throughout India. It is the country's single most comprehensive source of data on population, health, family welfare and nutrition, and its findings are disaggregated down to the district level.

• Conducting agency: The survey is conducted by the International Institute for Population Sciences (IIPS), Mumbai, which functions as the nodal agency on behalf of the Union Ministry of Health and Family Welfare (MoHFW). IIPS is an autonomous institution under the MoHFW and is regarded as a regional and national centre of excellence in population studies. Fieldwork is implemented through a network of selected field/survey agencies and Population Research Centres.

• History and rounds: The first NFHS was conducted in 1992-93. Subsequent rounds were carried out in 1998-99 (NFHS-2), 2005-06 (NFHS-3), 2015-16 (NFHS-4) and 2019-21 (NFHS-5). The newly released NFHS-6 was conducted in 2023-24 and is the first full round to be completed after the COVID-19 pandemic. A distinctive feature of NFHS-6 is that, for the first time, all aspects of the survey were coordinated solely by IIPS.

• Purpose: The data serve two long-standing goals — first, to provide the MoHFW and other agencies with essential evidence for designing and monitoring health and family-welfare programmes; and second, to track emerging health issues over time. NFHS estimates feed directly into India's monitoring of the Sustainable Development Goals (SDGs) and the National Health Policy targets.

• The release: On 29 May 2026, the MoHFW released the NFHS-6 factsheets for India, the States and the Union Territories. The survey covered roughly 6.79 lakh households across 715 districts in all States and UTs except Manipur.

• What a factsheet is: A "factsheet" is a short, headline summary document of selected "key indicators" released soon after a survey round is completed. It precedes the much larger, detailed national report (which typically follows a few months later). The factsheet is therefore the first and most widely-cited snapshot of a survey round's results, and is what the media, policymakers and aspirants read first.

• The core issue: The NFHS-5 factsheet carried 131 key indicators; the NFHS-6 factsheet carries 101. The reduction of about 30 net indicators (with reports suggesting around 43 dropped and 13 added) is the heart of the controversy, because several of the removed indicators were politically and socially sensitive — anaemia, sex ratio at birth, mortality, cancer screening, clean cooking fuel and sanitation.

• An important caveat: It is not yet confirmed whether every dropped indicator is permanently gone, or whether some will reappear in the detailed national report expected later. This distinction matters for a balanced reading of the issue.

• Population and vital statistics removed: The factsheet no longer reports the sex ratio at birth, infant and child mortality rates, and the percentage of births and deaths recorded in the civil registration system. The sex ratio at birth is a sensitive social indicator linked to son-preference and sex-selective practices; mortality rates are core measures of public-health outcomes.

• Nutrition indicator removed — anaemia: The single most discussed omission is anaemia prevalence. Earlier rounds tracked anaemia across children, adolescents, pregnant women and adults, making NFHS one of the most complete pictures of nutritional health in the country. NFHS-6 still reports inputs such as iron-folic acid (IFA) consumption, but no longer reports the outcome — whether people actually became less anaemic.

• Disease screening and awareness removed: Data on screening for the three most common cancers — cervical, breast and oral — have been removed, as has data on HIV awareness and service delivery. The waist-to-hip ratio, an indicator of abdominal obesity linked to diabetes and hypertension, was also dropped.

• Scheme-linked indicators removed: The factsheet no longer reports the percentage of households using clean fuel for cooking, nor access to improved sanitation facilities (toilets). These map directly onto two flagship programmes — the Pradhan Mantri Ujjwala Yojana and the Swachh Bharat Mission.

• Women's health and family planning removed: Several indicators were removed, including the adolescent fertility rate, the type of contraceptive being used, whether health workers counselled women on family planning and informed them of side-effects, and the out-of-pocket expenditure per delivery (a measure of financial protection in maternal care).

• The official explanation: Sources in the MoHFW have explained that several of these data points are now being collected and reported by other dedicated surveys, and that removing them from NFHS is an attempt at "data harmonisation" between the various data-collection exercises of the government. In simple terms, harmonisation means avoiding duplication — having each statistical instrument report what it measures best, so that different government surveys do not produce overlapping or conflicting numbers on the same indicator.

• Which survey is taking over which indicator: The government's position links each dropped indicator to an alternative source.

• Mortality, fertility and vital registration to the SRS: Infant mortality, maternal mortality and the registration of births and deaths are stated to be available in the Sample Registration System (SRS). The Total Fertility Rate, the government notes, is also captured in the SRS.

• Cooking fuel and sanitation to scheme reports: Data on cooking fuel is said to be available in the Ujjwala scheme reporting, and data on sanitation in the Swachh Bharat reporting.

• Cancer data to the ICMR: Data on cancer screening and prevalence is to be provided by other surveys, with the Indian Council of Medical Research (ICMR) usually providing cancer-prevalence estimates.

• Anaemia to the Diet and Biomarker Survey: Anaemia is to be measured by the "Diet and Biomarker Survey" (DABS) conducted by the National Institute of Nutrition.

• The methodological argument on anaemia: There is a genuine scientific reason cited for dropping anaemia. NFHS measured haemoglobin using a drop of blood from a finger prick (the capillary method). Many experts have argued this approach can overestimate anaemia prevalence, and that a venous blood sample (drawn from a vein) gives a more accurate reading. The Diet and Biomarker Survey is expected to use the venous method. This is a legitimate technical debate, not merely a political one.

• The "inputs without outcomes" problem: The most substantive criticism is that NFHS-6 continues to measure programme inputs (such as IFA tablet consumption) while removing programme outcomes (such as whether anaemia actually fell). Measuring what is fed into a scheme while no longer measuring what comes out of it makes it much harder to judge whether the scheme is working.

• The single-source advantage of NFHS: A second concern is comparability and independence. NFHS uniquely measured population health, nutrition, disease and scheme-related outcomes within one survey, using one consistent methodology, at the district level, by an autonomous body. When indicators are scattered across SRS, ICMR scheme dashboards and a separate nutrition survey, it becomes harder to cross-check them against socio-economic background characteristics in one place, and continuity with earlier rounds is broken.

• The political context: Several of the removed indicators had previously produced uncomfortable findings. NFHS-5 had recorded high and even rising anaemia, less-than-universal clean-fuel use and incomplete open-defecation-free status — numbers that invited scrutiny of flagship schemes. Critics argue that removing exactly these indicators creates the appearance of avoiding scrutiny. (As an exam answer, this is best presented neutrally as one perspective in a transparency debate, balanced against the genuine harmonisation and methodological arguments.)

• While 101 indicators is fewer than before, NFHS-6 did not only subtract — it added new themes reflecting a broader, modern understanding of health as linked to economic and social empowerment. New or expanded areas include the reach of Direct Benefit Transfer (DBT) under welfare schemes, Self-Help Group (SHG) coverage, digital literacy, financial inclusion and banking access among women, and household financial transactions. These additions signal a shift toward capturing the social determinants of health rather than only clinical outcomes.

• Maternal and child health gains: Institutional deliveries rose from 88.6% to 90.6%, moving India closer to universal safe childbirth. Antenatal care (ANC) registration reached 95.9%, and first-trimester ANC rose from 70.0% to 76.2%. Births attended by skilled health personnel improved from 89.4% to 91.3%.

• Fertility stabilising: India's Total Fertility Rate (TFR) — the average number of children a woman would bear over her reproductive years — held steady at 2.0, below the replacement level of 2.1, indicating a stabilising population.

• Nutrition improving but uneven: Child stunting (chronic undernutrition) fell from 35.5% to 29.3%, and severe wasting fell from 7.7% to 5.2%. However, dietary diversity and IFA compliance remained weak, with only 37.8% of pregnant women reportedly consuming IFA tablets for the recommended 180 days.

• Immunisation surge: Rotavirus vaccine coverage more than doubled from 36.4% to 85.4%, and over 95% of childhood immunisation was delivered through the public system. Yet about 12.9% of children aged 12-23 months still missed full immunisation.

• The rising NCD burden — the new red flag: Overweight/obesity among women aged 15-49 rose from 24% to 30.7% (urban 42.8%, rural 25.5%), and among men from 22.9% to 27.3% (urban 36.3%, rural 23%). High blood sugar prevalence rose among men (15.6% to 20.9%) and women (13.5% to 17.8%). Caesarean-section deliveries jumped from 21.5% to 27.2%, with urban rates near 40% — far above the WHO's recommended optimal band of 10-15%.

• Why statistical integrity matters: Reliable, comparable, independently-collected data is the foundation of evidence-based policymaking. Surveys like NFHS allow citizens, researchers and Parliament to evaluate whether public money spent on schemes produces results. Any reduction in the scope of such a survey raises questions that go beyond health and into the credibility of the national statistical system.

• The balancing principle: At the same time, harmonisation and methodological rigour are valid public-policy goals. Duplicated surveys waste resources, and a flawed measurement method (such as capillary-blood anaemia testing) can mislead policy. The genuine governance challenge is to harmonise without losing transparency, comparability over time, or the ability to measure outcomes — ideally by publishing a clear, documented crosswalk of which survey now owns which indicator, with methodology disclosed.

• Sample Registration System (SRS): A large-scale demographic survey by the Office of the Registrar General of India (RGI) that provides reliable estimates of birth rate, death rate, infant mortality and fertility, used as a continuous source between Censuses.

• Civil Registration System (CRS): The compulsory, continuous recording of births and deaths under the Registration of Births and Deaths Act, 1969 (amended 2023), administered by the RGI.

• Replacement-level fertility: A TFR of 2.1, the level at which a population exactly replaces itself from one generation to the next without migration.

• Non-Communicable Diseases (NCDs): Chronic, non-infectious conditions such as diabetes, hypertension, cardiovascular disease and cancers, addressed through the National Programme for Prevention and Control of NCDs and screening at Ayushman Arogya Mandirs.

• Anaemia Mukt Bharat (AMB): A strategy launched in 2018 to reduce anaemia across six target groups through iron-folic acid supplementation, deworming and dietary diversification.

• Data Snapshot — NFHS-5 vs NFHS-6 (selected indicators): Indicator

NFHS-5 (2019-21) NFHS-6 (2023-24) Total key indicators in factsheet 131 101 Total Fertility Rate (TFR) 2.0 2.0 (below replacement 2.1) Institutional deliveries 88.6% 90.6% First-trimester ANC 70.0% 76.2% Births by skilled personnel 89.4% 91.3% Caesarean-section deliveries 21.5% 27.2% (urban ~40%) Child stunting 35.5% 29.3% Severe wasting 7.7% 5.2% Rotavirus vaccine coverage 36.4% 85.4% Obesity (women 15-49) 24% 30.7% Obesity (men) 22.9% 27.3% High blood sugar (men 15+) 15.6% 20.9% High blood sugar (women 15+) 13.5% 17.8% Anaemia prevalence Reported Not reported Sex ratio at birth Reported Not reported Cancer screening (cervical/breast/oral) Reported Not reported Data Snapshot — Where dropped indicators are now said to be sourced:

• Dropped from NFHS-6

Government's alternative source Infant/maternal mortality, fertility, birth/death registration Sample Registration System (SRS) Clean cooking fuel Pradhan Mantri Ujjwala Yojana reporting Sanitation / toilets Swachh Bharat Mission reporting Cancer screening and prevalence Indian Council of Medical Research (ICMR) Anaemia prevalence Diet and Biomarker Survey (DABS), National Institute of Nutrition