Final answer:
The concept that refers to the number of live births per year for every 1,000 women of a certain age group is the fertility rate, which helps in understanding population growth.
Step-by-step explanation:
The concept that refers to the number of live births per year for every 1,000 women of a certain age group is known as the fertility rate. This demographic measure is used to estimate the actual number of children born in a society and is an important factor for understanding population growth and its characteristics. The fertility rate can be influenced by numerous factors including economic conditions, societal norms, health issues, and governmental policies. It differs from the crude birth rate, which is the number of live births per 1,000 people per year, regardless of gender or age. Mortality rates, also known as death rates, are used in conjunction with fertility rates to assess the overall population growth or decline within a region.