Question

1. the following scenario was taken from a case - control study examining whether exposure to secondhand smoke during the prenatal period among infants with nonsmoking mothers is associated with an increased risk for orofacial clefts. in northern china, investigators recruited 101 infants with orofacial clefts and 561 healthy infants. investigators interviewed each infants mother and asked about her secondhand smoke exposure during pregnancy. a total of 65 mothers of infants with orofacial clefts and 183 mothers with healthy infants reported exposure to secondhand smoke during the prenatal period. using this information, complete the 2x2 table below: (4 points) prenatal secondhand smoke exposure orofacial cleft no orofaci i cleft total yes a b c no d e f total g h 662 cell a number is enter answer cell b number is enter answer cell c number is enter answer cell d number is enter answer

Explanation:

Step1: Identify Cell A

Cell A represents the number of infants with orofacial clefts and prenatal second - hand smoke exposure. Given as 65.

Step2: Identify Cell B

Cell B represents the number of healthy infants (no orofacial cleft) with prenatal second - hand smoke exposure. Given as 183.

Step3: Calculate Cell C

Cell C is the sum of Cell A and Cell B. So, \(C=65 + 183=248\).

Step4: Calculate Cell D

Cell D is the number of infants with orofacial clefts and no prenatal second - hand smoke exposure. Total infants with orofacial clefts \(G = 101\). So, \(D=101-65 = 36\).

Answer:

Cell A number is 65
Cell B number is 183
Cell C number is 248
Cell D number is 36