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 BMI (body mass index) larger than 25 (or equal to 25) and 0 for less than 25. The study also collected other covariates which are listed below Based on this dataset, answer the following questions. 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

1.1 No, Odds ratios (OR) are not same among all the races. White race has higher OR = 1.99665, 95% CI 1.18 to 3.33) Statistically significant association as both the limits of 95% Confidence interval does not cross the null value 1 and both limit are above 1, therefore significant risk. Odd ratio (OR) for Black = 1.78125, 95% CI 0.78 to 4.07), statistically no significant association as lower limit of confidence interval cross the null value 1, odds ratio (OR) for Latino = 1.727324, (95% CI, 0.91 to 3.2) since lower limit of CI cross the null value 1 therefore, statistically not significant. Odd ratio (OR) for others = 0.703125, 95 CI, 0.10 to 3.5, since upper limit cross the value 1, therefore not statistically significant association but odds ratio is below 1 therefore towards to protective side but not significantly protective

1.2 Odds ratio (OR) of Caesarian section for overweight (BMI > 25) vs Normal (<= 25) for white race = 1.99665, It is statistically significant as 95% Confidence interval = 1.180707 to 3.334323 does not crosses the null value 1, both the lower limit and upper limit of 95% confidence are above null value 1, therefore it is statistically significant association. Finding suggest that there is 99% higher risk for caesarian section if overweight (BMI = > 25) compared with normal (BMI<=25) in white race

1.3 Odds ratio for caesarian section for mother for being overweight (BMI>25) = 1.757613 (95% CI = 1.266319 to 2.439512). The finding suggests that there is statistically significantly higher risk (75% higher than normal) association for risk of caesarian section for overweight mothers (BMI>25) as compared with normal weight (BMI<=25). Since both the limits of 95% CI (lower and upper limit) does not cross the null value 1, therefore, statistically significant association.

1.4 Overall crude odd ratio is 2.005186 (95% CI 1.466781 to 2.73)

The Odds Ratio is a measure of association which compares the odds of disease of those exposed to the odds of disease those unexposed.

Formulae

1,5 Combined Odds ratio = 1.757613 (95% CI = 1.266319 to 2.439512). Since both the limits of 95% CI (lower and upper limit) does not cross the null value 1, therefore, statistically significant association.

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