For NRR to be 1, Couple protection rate should be
## **Core Concept**
The Net Reproduction Rate (NRR) is a demographic measure that indicates the number of daughters a woman would have in her lifetime under the prevailing age-specific fertility and mortality rates. An NRR of 1 means that, on average, a woman is replacing herself with one daughter, which implies a stable population size over time, assuming no changes in mortality rates. The Couple Protection Rate (CPR) refers to the percentage of couples of reproductive age using some form of modern or traditional contraceptive method.
## **Why the Correct Answer is Right**
For the NRR to be 1, the Couple Protection Rate (CPR) needs to be sufficiently high to reflect a situation where couples are effectively limiting their family size to, on average, two children (considering a sex ratio at birth and child survival rates). A CPR of **75%** is often cited as a rough estimate required for achieving an NRR of 1. This is because a high level of contraceptive prevalence indicates that a significant proportion of couples are actively managing their fertility, which can lead to a reduction in total fertility rates and subsequently an NRR of 1.
## **Why Each Wrong Option is Incorrect**
- **Option A:** A CPR of less than 50% is generally considered too low to have a significant impact on fertility rates, making it unlikely to achieve an NRR of 1.
- **Option B:** While a CPR of 60% is a significant level of contraceptive use, it might still be insufficient to reduce the NRR to 1, depending on the desired family size and effectiveness of contraceptive methods used.
- **Option D:** A CPR of more than 90% would likely be more than sufficient to achieve an NRR of 1, but it is not the minimum threshold.
## **Clinical Pearl / High-Yield Fact**
A key point to remember is that achieving an NRR of 1 requires a multifaceted approach, including high contraceptive prevalence, access to education, and empowerment of women. A commonly cited goal in family planning programs is to reach a CPR of at least 60-70%, but the exact threshold can vary depending on factors like desired family size and the effectiveness of contraceptive methods.
## **Correct Answer:** C. 75%