Surveys in India 1. National Family Health Survey 2020-21(NFHS-5) Year 2023 Sex ratio- 1020 Rural sex ratio- 1037 Urban sex ratio- 985 State having highest sex ratio- Kerala(sex ratio- 1084) Sex ratio at birth- 933 4 types of sex ratios according to the stages of development. Primary Sex Ratio- Sex ratio at Fertilization Secondary Sex Ratio- Sex ratio at Birth Tertiary Sex Ratio- Sex ratio at maturity Quaternary Sex Ratio- Sex ratio above the age of 60 years
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