[1]Population Division Department of Economic and Social Affairs United Nations New York NY 10017 USA;
[2]Department of Sociology Centre for Family and Population Research National University of Singapore Singapore;
Age concentration index; Age heaping; age ratio; Age reporting; Average age ratio; Average period age ratio; Average cohort age ratio; China; Census; Digit preference; Digit avoidance; Whipple’s index; Myer’s blended index;