Thesex ratio of the different administrative divisions ofChina has been the subject of academic study because of a high imbalance in births since the 1990s[citation needed] andfemale infanticide further worsening the imbalanced sex ratios at birth.
The figures are from the 2000 census, intercensus survey of 2005 (which was carried out in November 2005 on a representative 1% of the total population), 2010 census, and 2020 census.[6]
Figures for Hong Kong are from the 2001 census, 2011 census, and the 2021 census conducted separately byCensus and Statistics Department of Hong Kong.
^"表1—12 省、自治区、直辖市分性别、月份的出生人口(1999.11.1-2000.10.31)" [Table 1-12 Births by gender and month by provinces, autonomous regions, and directly-administered municipalities].www.stats.gov.cn (in Chinese). Retrieved2025-07-15.
^"表1—7 省、自治区、直辖市分性别、年龄的人口" [Table 1-7 Population by Provinces, Autonomous Regions, and Directly Administered Municipalities by Age and Gender].www.stats.gov.cn (in Chinese). Retrieved2025-07-14.
^"1-7 各地区分年龄、性别的人口" [1-7 Population by regions by age and gender].www.stats.gov.cn (in Chinese). Retrieved2025-07-14.
^"1-5 各地区分年龄、性别的人口" [1-5 Population by regions by age and gender].www.stats.gov.cn (in Chinese). Retrieved2025-07-14.