Question

luuens Tegularly attend class and receiving A's independent? Explain why or why not. Question 5: [ 8 Marks] In a prospective study of pregnant women, information was collected on exercise level of low-risk pregnant working women. A group of 217 women did no voluntary or mandatory exercise during the pregnancy, while a group of 238 women exercised extensively. One outcome variable of interest was experiencing preterm labour. Results are shown in the Table2. Table 2: Cases of preterm Non cases of Preterm Total Risk Factor Labour Labour Extreme exercising Not exercising 216 238 217 18 199 415 Total Adapted from Mind on Statistics, MacGillivray, Utts & Heckard, 2n* Edition, Ex 12.28, p565 Adapted from Biostatistics A Foundation for a Analysis in the Health Sciences, W. Daniel, 8 FBUS105 S1 2019 Edition, Ex 12.71, p637 Answer the following questions (zive all your answers to 1 decimal places): (a) [4 Marks] Calculate the relative risk of preterm labour when pregnant women exercise extensively. Interpret this value. (b) [4 Marks] Calculate the odds ratio of preterm labour when pregnant women exercise extensively. Interpret this value

Answer 1

Let us represent the given 2X2 contingency table in the following form,

Risk\Labour	Cases of Preterm Laboor	Non Cases of Preterm Labour	Total
Extreme Exercising	a = 22	b = 216	238
Not Exercising	c = 18	d = 199	217
Total	40	415

Part (a)

Relative Risk 23. 1.1144 18 217 c+d

Interpretation :

There is (RR - 1) x 100 = 11.44% increase in risk of Preterm labour, due to extreme exercising

Part(b)

Ratio j = 16199=1.1200 Odds Ratio216 18 1.1260 = J =

The Odd's Ratio being greater than 1 denotes that there is a greater chance of Preterm Labour occuring due to Extreme excercising.