Question

PPH4801/MPHDHM9 Jan/Feb 2018 SECTCION B: QUESTION 1 Match each of the following studies as, and descnbe the advantages each a Expenmental b Observatonal cohort c Observational case-control e Not an analytical or epidemiologic study -Representative sample of residents were telephoned and asked how much they exercise each week and whether they currently have (have ever been diagnosed with) heart disease 2 Occurrence of cancer was identfied between Apni 1991 and July 2002 for 50,000 troops who served in the first Guff War (ended Apri 1991) and 50,000 troops who served eisewhere during the same period 3 Persons diagnosed with new-onset Lyme disease were asked how often they walk through woods, use insect repellant, wear short sleeves and pants, etc Twice as many without Lyme disease from the same physician's practice were asked the same questions, and the responses in the two groups were compared patents 4 Subiects were children enrolled in a health maintenance organization At 2 months, each child was randomly given one of two types of a new vaccine against rotavirus infection Parents were called by a nurse two weeks later and asked whether the children had experenced any of a list of side effects 125]

Answer 1

Answer:

Experimental: ( 4) Subjects were children enrolled in health maintenance organisation. At 2 months each child was randomly given one or two types of a new vaccine against rotavirus infection.

Observational cohort : (2) Occurance of cancer was identified between April 1991 and July 2002.

Observational cross section: (1) Representative sample of resident were telephoned and asked how much they exercise.

Case control: (3) Person diagnosed with new on set Lyme disease were asked how often they work through woods.