A district has a Crude Birth Rate of 18.2 per 1000 population and a Crude Death Rate of 6.8 per 1000 population for a given year. The rate of natural increase for this district is:
- A 11.4 per 1000 population ✓
- B 24.8 per 1000 population
- C 11.4 percent
- D 2.68 percent
Correct answer: A. 11.4 per 1000 population
Explanation
Rate of natural increase equals Crude Birth Rate minus Crude Death Rate, expressed per 1000 (or sometimes per cent) of mid-year population. Here 18.2 minus 6.8 gives 11.4 per 1000 population. It excludes migration, so no other data are needed. Option B adds the two rates instead of subtracting, and options C and D convert the figure into percentages incorrectly; expressed as a percentage the natural increase would be 1.14 percent, not 11.4.
Reference: Park's Textbook of Preventive and Social Medicine, 27th ed.
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