Question

•Two thousand pregnant women were identified during their first trimester and completed questionnaires about health behaviors. Among the 840 women who smoked, 118 had low birth weight infants (<2500g). Among the 1160 women who did not smoke, 56 had low birth weight infants.

•What kind of study is this?

•What is the measure of association?

•Create a 2 X 2 table on the data presented and calculate the appropriate measure of association. Please interpret your findings.

Answer 1

Kind of study : case control study.

a case control study as a type of obsenvotional study is which two Existing groups differing is outcome are identified and compared on The Basis & some supposed casual atsibute

Measure of association;

measure of association between the - Exposure and occurera of disease & otherwise called as odd ratio. It is used to measure the association I between smoking and low birth weight of chilelser snobov

2×2 table:

Smoke as low Birth we Infants t(ease) - (control) 118 (as I 722(6) 7 840 Carb) 56( I 1104 cod 1160 ceeds 174 late 1826 2000 cbtd I nl Non smokers

Odds ratio;

odda aatio = //old 118 x 1104 boc #22 x 56 = 130272 40, 432 I oddratio = 3.22 |

Inference:

Smokers are 3.22 times more risk for the occurrence of low birth weight compared to non smokers.