The types of chores girls spend their time on include cooking, cleaning, caring for family members, collecting firewood and water.
"The burden of domestic work begins early, with girls between 5 and 9 years old spending 30 per cent more time, or 40 million more hours a day, on household chores than boys of their age," said the report titled 'Harnessing the power of data for girls: taking stock and looking ahead to 2030'.
The report further adds that in certain regions the gender disparities are worse.
"In Middle East and North Africa and South Asia regions, girls aged 5-14 years spend nearly twice as many hours per week on household chores as boys of the same age."
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The countries where girls between 10 to 14 years old bear the most disproportionate burden of household chores compared to boys are Burkina Faso, Yemen and Somalia.
"The uneven distribution of unpaid household chores leads societies to believe that a girl's primary role is at home. It simultaneously reinforces gender stereotypes and perpetuates girls' and women's economic dependence," UNICEF said in a statement.
The report also underlines the importance of filling up gaps in "gender data" so that it can be used to frame policies to address discrimination between the sexes.