Population: Total population and distribution by age and sex estimated to be consistent with the population by age and sex of the (a) 1951, 1956, 1961, 1966, 1976, 1981, 1986, 1991, 2001, 2006, 2011, 2016 censuses; (b) adjusted for under/over count; (c) adjusted for age heaping; (d) adjusted for under enumeration of children under age 15; (e) official estimates through 2020; (f) only total population for 1945, 1971 censuses; and with estimates of the subsequent trends in fertility, mortality and international migration.  In addition, the 2019-2020 MICS survey estimates have been considered.

Fertility: Total fertility rate and age pattern of fertility based on: (a) official estimates of age-specific fertility rates through 2014; (b) registered births classified by age of mother and the underlying female population by age through 2019; (c) birth-histories data from the 2009, 2014 DHS and 2019-2020 MICS; (d) births in the household in the preceding 12 (or 24) months classified by age of mother from the 1981, 1991, 2001, 2006, 2011, 2016 censuses and 1999 DHS; (e) adjusted fertility using Brass P/F ratio method (or variants) with data on children ever born and births in the preceding 12 (or 24/36) months, both classified by age of mother, from the 1966, 1971, 1976, 1986, 1991, 2001, 2006, 2011 censuses; (f) indirect estimates obtained from the application of the reverse survival method to the 1951, 1956, 1961, 1966, 1976, 1986, 1991, 2001, 2006, 2011, 2016 censuses and 1957-2012 Education Stats and 2000 DVSS; (g) indirect estimates obtained from the application of the own-children method of fertility estimation to the 1961, 1966, 1971, 1986, 1991 censuses; (h) cohort-completed fertility backdated by the mean age of childbearing from the 1956, 1961, 1966, 1971, 1976, 1981, 2001 censuses.  In addition, the (a) indirect estimates obtained from the application of the reverse survival method to the 2019-2020 MICS; (b) cohort-completed fertility backdated by the mean age of childbearing from the 2019-2020 MICS have been considered.

Child Mortality: Under-five mortality based on: (a) direct estimates from births and deaths under-five calculated from full birth histories data from the 2019-2020 MICS; (b) indirect estimates from data on children ever born and surviving from the 1956, 1961, 1966, 1976, 1981, 2001, 2006, 2016 censuses and 1999 DHS and 2000 DVSS; (c) recent household deaths from the 1999 DHS and 2011 Census; (d) International estimates used up to 2021.  In addition, the (a) registered infant and child deaths through 2016; (b) direct estimates from births and deaths under-five calculated from full birth histories data from the 2009, 2014 DHS; (c) indirect estimates from data on children ever born and surviving from the 1971 Census; (d) recent household deaths from the 2000 DVSS and 2001, 2006, 2016 censuses have been considered.

Overall Mortality: Life expectancy at birth and age pattern of mortality based on: estimates using LogQuad model life tables and estimates of under-five mortality (5q0), and adult mortality (45q15).  In addition, the (a) registered deaths by age and sex available through 2016; (b) registered deaths by age and sex available through 2016; (c) adjusted for underreporting of infant and child deaths; (d) adult deaths adjusted for underregistration using death distribution methods; (e) mortality rates for older ages were adjusted have been considered.

Adult and Old Age Mortality: Estimates derived from: (a) recent household deaths data by age and sex from the 2011 Census; (b) recent household deaths adjusted at adult ages for underregistration using death distribution methods; (c) estimates of under-five, adult and old age mortality.  In addition, the (a) deaths by age and sex available from Register through 2016; (b) adjusted for underregistration; (c) recent household deaths data by age and sex from the 2000 DVSS and 2006, 2016 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.