Population: Total population and distribution by age and sex estimated to be consistent with the population by age and sex of the (a) 1953, 1964, 1982, 1990, 2000, 2010, 2020 censuses; (b) official estimates through 2021; and with estimates of the subsequent trends in fertility, mortality and international migration.  In addition, the (a) adjusted for under/over count; (b) adjusted for age heaping; (c) adjusted for under enumeration of children under age 15 have been considered.

Fertility: Total fertility rate and age pattern of fertility based on: (a) registered births classified by age of mother and the underlying female population by age through 2020; (b) adjusted for underregistration; (c) birth-histories data from the 1982 One-per-Thousand FS and 1988 Two-per-Thousand FS and 1992 Fertility Survey and 1997, 2001 FPRHS and 2017 NFS; (d) period parity progression ratios based on data on women and births in the preceding 12 months, both classified by age of mother and parity, from the 1982, 1990, 2000 censuses and 1987 One-percent Survey and 1988 Two-per-Thousand FS and 1992 Fertility Survey and 1997, 2006 FPRHS; (e) births in the household in the preceding 12 (or 24) months classified by age of mother from the 1950-2020 Estimates and 1987, 1995, 2005, 2015 One-percent Survey and 1989, 1990, 1991, 1992, 1993, 1994, 1996, 1997, 1998, 1999, 2001, 2002, 2003, 2004, 2006, 2007, 2008, 2009, 2011, 2012, 2013, 2014, 2016, 2017, 2018, 2019 Annual APC and 1990, 2000, 2010, 2020 censuses and 2018 NHSS; (f) adjusted fertility using synthetic relational Gompertz model with data on children ever born and births in the preceding 12 (or 24/36) months, both classified by age of mother, from the 1990, 2000, 2010 censuses; (g) indirect estimates obtained from the application of the reverse survival method to the 1950-2020 Estimates and 1950-2020 Immunizations and 1953, 1982, 1990, 2000, 2010, 2020 censuses and 1965-2015 Education Stats and 1987 Annual APC; (h) indirect estimates obtained from the application of the own-children method of fertility estimation to the 1987 One-percent Survey; (i) indirect estimates obtained from reconstructed birth histories data from the 1987 One-percent Survey and 1988 Two-per-Thousand FS and 1990, 2000 censuses.  In addition, the (a) official estimates of age-specific fertility rates through 2020; (b) cohort-completed fertility backdated by the mean age of childbearing from the 1982, 1990, 2000 censuses have been considered.

Child Mortality: Under-five mortality based on: (a) registered infant and child deaths through 2019; (b) direct estimates from births and deaths under-five calculated from full birth histories data from the 1988 Two-per-Thousand FS and 1992 Fertility Survey; (c) indirect estimates from data on children ever born and surviving from the 1982 Census and 1982 One-per-Thousand FS and 1987 IDFS; (d) recent household deaths from the 1955-1990 RRMCM and 1973-1975 Cancer Survey and 1982 Census and 1987 IDFS and 1990-2019 Annual CDC and 2005 One-percent Survey; (e) International estimates used up to 2021.  In addition, the (a) official estimates of infant and child mortality through 2017; (b) direct estimates from births and deaths under-five calculated from full birth histories data from the 2005 One-percent Survey; (c) indirect estimates from data on children ever born and surviving from the 1990, 2000, 2010 censuses; (d) recent household deaths from the 1987 One-percent Survey and 2004-2005 NRSCD and 2010 Census have been considered.

Overall Mortality: Life expectancy at birth and age pattern of mortality based on: (a) registered deaths by age and sex available through 2010; (b) adjusted for underreporting of infant and child deaths; (c) adult deaths adjusted for underregistration using death distribution methods; (d) mortality rates for older ages were adjusted.  In addition, the (a) official estimates through 2007; (b) registered deaths by age and sex available through 2020 have been considered.

Adult and Old Age Mortality: Estimates derived from: (a) recent household deaths data by age and sex from the 1982, 1990 censuses and 1990-2019 Annual CDC and 2005 One-percent Survey; (b) recent household deaths adjusted at adult ages for underregistration using the growth balance method; (c) recent household deaths adjusted at adult ages for underregistration using death distribution methods; (d) intercensal survivorship from successive census age distributions; (e) estimates of under-five, adult and old age mortality.  In addition, the recent household deaths data by age and sex from the 1987 One-percent Survey and 2000, 2010, 2020 censuses have been considered.

Migration: International migration based on: (a) information on foreign-born populations from censuses and registers from major countries of destination; (b) estimates derived as the differences between overall population growth and natural increase; (c) UNHCR statistics on the number of refugees in the main countries of asylum.