Question

Asked Feb 12, 2019

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1. A study is run to estimate the association between exposure to lead paint in childhood and attention-deficit hyperactivity disorder (ADHD). Data on n = 400 children are collected and data on exposure and ADHD diagnosis are shown below.

Exposure to Lead Paint ADHD No ADHD

Yes 34 71

No 29 266

A. Estimate the crude or unadjusted relative risk.

B. Estimate the crude or unadjusted odds ratio.

I am having trouble with question on my homework. Please provide some assistance.

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Step 1

**Given information:**

It is given that, in order to estimate the difference between exposure to lead paint in childhood (exposure) and attention deficit hyperactivity disorder (ADHD), a sample of 400 children are considered and the data on exposure and ADHD diagnosis is given below:

Step 2

**Obtain the estimate of the crude or unadjusted relative risk.**

*Relative risk:*

The relative risk is the ratio of two probabilities.

Consider that the probability or risk of ADHD in exposure to lead paint is denoted by *R*_{1}.

The probability or risk of ADHD in No exposure to lead paint is denoted by *R*_{2}

The crude or unadjusted relative risk is obtained as **3.2939 **from the calculation given below:

Step 3

**Obtain the estimate of the crude or unadjusted odds ratio.**

*Odds ratio:*

The odds ratio is the ratio of two odds. Odds of an event will be the number of events divided by number of non-events.

That is, odds will be calculated as *p*/(1–*p*).

The odds of *ADHD *in exposure to lead paint will be (odds of *ADHD *in exposure to lead paint/ odds of no *ADHD *in exposure to lead...

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