These are data of Indian national demographic survey "Sample Registration System" (SRS).
This is a list of Indian states by life expectancy at birth.
The figures come from the Human Development Index Report, published in 2011, by United Nations Development Programme (UNDP) India[5] and Sample Registration Survey (SRS) based life table 2010–14.
[6][7] The report provides life expectancy at birth based on mortality rates in years 2002–06, 2010–14, 2019, and 2019-21.
Data about life expectancy according to a 2024 study by Yadav et al. which estimates district and state-wise life expectancy model-based (Bayesian hierarchical model) using NFHS-5 data on infant mortality rate and life tables showing age-specific mortality rates.