Lesson 3: Measures of Risk
Section 4: Natality (Birth) Measures
Natality measures are population-based measures of birth. These measures are used primarily by persons working in the field of maternal and child health. Table 3.11 includes some of the commonly used measures of natality.
Table 3.11 Frequently Used Measures of Natality
| Measure | Numerator | Denominator | 10n |
|---|---|---|---|
| Crude birth rate | Number of live births during a specified time interval | Mid-interval population | 1,000 |
| Crude fertility rate | Number of live births during a specified time interval | Number of women ages 15–44 years at mid-interval | 1,000 |
| Crude rate of natural increase | Number of live births minus number of deaths during a specified time interval | Mid-interval population | 1,000 |
| Low-birth weight ratio | Number of live births <2,500 grams during a specified time interval | Number of live births during the same time interval | 100 |
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