Being overweight is considered as a risk factor for having caesarean sections. T

Question

Being overweight is considered as a risk factor for having caesarean sections. The outcome variable (deliverymethod) is coded as 1 for caesarean section and 0 for natural delivery. The risk variable (bmicat) is coded as 1 for BMl (body mass index) large than 25 (or equal to 25) and 0 for less than 25. Given the STATA output below. 1.1 Are the odds ratios among four race groups are same? 1.2 What is the odds ratio of caesarean section for overweight (BMI > 25) vs. normal weight (BMI 25) vs. normal weight (BMI

Explanation / Answer

1.

No, Odds ratio are not same in all the race. Becuase, the if we see the confidence interval there is a large varaition between among the races.

2.

OR of caesarean section for over wight(BMI >25) vs. normal weight (BMI<=25) for white is 1.99665. And it is statistically significant becuase, the 95% CI for OR does not include 1.

3.

Odds Ratio of having caesarean section for being over wight(BMI >25) vs. normal weight (BMI<=25) mothers is 2.0051 and it is statistically significant as the 95% CI for the Odds Ratio does not include 1 in it.

4.

Overall crude odds ratio is 2.0051. It can be calculated without considering the Race.

If we do not consider the rac, we will have the below 2-by-2 table for Delivey Method Vs BMI

Caesarean Section

Natural Delivery

BMI <=25

A

B

BMI >25

C

D

Crude OR = AD/BC.

1.5

The combined OR is 1.7576 and it is statistically signifcant as the 95% CI of the OR does not invlove 1 in it.

Caesarean Section

Natural Delivery

BMI <=25

A

B

BMI >25

C

D

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