Age group National death rate per 1000 Hazardous industry worker population Observed deaths 25-34 2.0 3000 8 35-44 3.5 2000 9 45-54 6.0 2000 13
Hazardous Industry Worker SMR Calculation
This section details the calculation of the Standardized Mortality Ratio (SMR) for hazardous industry workers compared to the national population using the provided data.
1. Calculate Expected Deaths per Age Group
Expected deaths are calculated by applying the national death rate to the specific population of hazardous workers in each age group.
Formula: $ \text{Expected Deaths} = \left( \frac{\text{National Death Rate}}{1000} \right) \times \text{Worker Population} $
- Age 25-34: $ \left( \frac{2.0}{1000} \right) \times 3000 = 6 $
- Age 35-44: $ \left( \frac{3.5}{1000} \right) \times 2000 = 7 $
- Age 45-54: $ \left( \frac{6.0}{1000} \right) \times 2000 = 12 $
2. Sum Observed and Expected Deaths
Aggregate the deaths across all age groups.
- Total Observed Deaths: $ 8 + 9 + 13 = 30 $
- Total Expected Deaths: $ 6 + 7 + 12 = 25 $
3. Compute the Standardized Mortality Ratio (SMR)
The SMR compares the observed mortality in the worker group to the expected mortality based on national rates.
Formula: $ SMR = \left( \frac{\text{Total Observed Deaths}}{\text{Total Expected Deaths}} \right) \times 100 $
Calculation: $ SMR = \left( \frac{30}{25} \right) \times 100 = 1.2 \times 100 = 120 $
The calculated SMR for the hazardous industry workers is 120.
Important Questions from Biostatistics
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PTB Total Sputum microscopy Present Absent Positive 270 20 290 Negative 30 180 210 Total 300 200 500 In a cohort of 500 women attending antenatal clinic, 70 % had ultrasonography (USG). This cohort was followed up at delivery. Of the women who had USG, 70 delivered low birth weight (LBW) babies; whereas of the women, who did not undergo USG, 50 delivered LBW babies. The incidence of LBW babies among women who had USG is:
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