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UGANDA CHRISTIAN UNIVERSITY
UNIVERSITY EXAMINATIONS 2011
SECOND YEAR JANUARY SEMESTER EXAMINATIONS
FOR THE DEGREE OF BACHELOR OF COMMUNITY HEALTH
COURSE: BIOSTATISTICS AND EPIDEMIOLOGY
DATE: April 2011
TIME: 3 hours
________________________________________________________________________
INSTRUCTIONS:
· This exam has two parts; 1 and 2
· Answer questions according to the instructions in each part.
· Answer each part in a different answer booklet.
· Answer any four questions.
· Do not write anyth

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UGANDA CHRISTIAN UNIVERSITY UNIVERSITY EXAMINATIONS 2011 SECOND YEAR JANUARY SEMESTER EXAMINATIONS FOR THE DEGREE OF BACHELOR OF COMMUNITY HEALTH COURSE: BIOSTATISTICS AND EPIDEMIOLOGY DATE:
April 2011
TIME:
3 hours ________________________________________________________________________
INSTRUCTIONS:
·
This exam has two parts; 1 and 2
·
Answer questions according to the instructions in each part.
·
Answer each part in a different answer booklet.
·
Answer any
four
questions.
·
Do not write anything on the question paper
·
Mobile phones are not allowed in the Examination room ________________________________________________________________________
PART ONE: BIOSTATISTICS
Answer all questions in section A and any ONE from section B
SECTION A: Answer all questions
1.
(a) Describe the properties of a normal curve. (
4 Marks
) (b) The sugar levels in the blood of a sample taken at Mukono Health Centre, are normally distributed with mean 12 and standard deviation 2.5, find the probability that the levels are i.
Below 7
(5 Marks)
ii.
Between 8 and 10
(8 Marks)
iii.
The value of the sugar level at which 25.78% of the patients fall
(8 Marks
) 2. What are the characteristics of binomial probability?
(3 Marks)
A study carried by Mukono University examined national attitudes about tranquilizers. The study of 14 people revealed that approximately 0.7 believe that tranquilizers do not really cure anything they just cover up the real trouble. Find the probability that i.
Exactly five people believe that they do not cure but just cover up real trouble
(6 Marks)
ii.
At least five people believe that they do not cure but just cover up real trouble
(6 Marks)
iii.
Between 10 and 14 people believe that they do not cure but just cover up real trouble
(10 Marks)
2
SECTION B: Answer one question in this Section
3. The following scores represent the final examination grade for an elementary Mathematics course 24 13 28 15 25 29 15 46 9 10 17 22 23 17 16 32 11 12 18 20 13 27 18 22 20 14 26 14 19 19 40 31 17 21 23 26 18 24 21 27 Using interval of 5 starting at 5 a) Construct a frequency distribution.
(10 Marks)
b) Calculate i.
The mean
(2 Marks)
ii.
Mode
(5 Marks)
iii.
Median
(5 Marks)
Comment on the results in i, ii, and iii
(3 Marks)
4. Given the following frequency distribution
Class Frequency
51-60 3 61-70 7 71-80 10 81-90 12 91-100 7 101-110 3 111- 120 2 a) What is the I.
modal class
(2 Marks)
II.
median class
(2 Marks)
III.
class interval
(2 Marks)
b) Find I.
Variance
(15 Marks)
II.
Standard deviation
(2 Marks)
III.
Comment on the results in a and b above
(2 Marks)
5. The following represent the number of patients that came to the Health centre for 60 (sixty days) 23 60 79 32 57 74 52 70 82 36 80 77 81 95 41 65 92 85 55 76 52 10 64 75 78 25 80 98 81 67 41 71 83 54 64 72 88 62 74 43 60 78 89 76 84 48 84 90 15 79 34 67 17 82 69 74 63 80 85 61
3
Using interval nine, starting the lowest at 10. Table
(5 Marks)
i.
Set up a frequency distribution
(5 Marks)
ii.
Set up a relative frequency distribution
(5 Marks)
iii.
Set up a cumulative frequency distribution
(5 Marks)
iv.
Set up a relative cumulative frequency distribution
(5 Marks)
PART TWO: EPIDEMIOLOGICAL RESEARCH
SECTION A: Multiple Choice Questions (Select one correct Option) SECTION B: Essay Questions (Attempt one question only) SECTION A: Compulsory (Circle one correct Option)
1. Epidemiology is often defined as:- a) An observational science that links factors with heath related states b) The use of analytical techniques to study the distribution and determinants of disease c) The study of the application of interventions in the control of disease d) The action oriented scientific study of the distribution and determinants of disease 2. The Epidemiological Approach is often viewed as a two step approach. It involves:- a) Determining disease associated factors and testing associations to infer causality b) Measuring disease occurrence and testing associations to infer causality c) Observation of health related phenomena and describing the unusual patterns there from d) Determining causality and designing appropriately treated interventions 3. Herd immunity is the resistance of an entire population conferred by the fact that a critical proportion of the population is protected. The probability of a susceptible person meeting a diseased person is negligible. The above situation will only hold if the following assumption is true: a).That 95% of the population is vaccinated and immunized b).That the disease agent is restricted to one single host in which the disease occurs c).That transmission is indirect, with an extra-human reservoir d).That the population is organized in structured communities with minimal mixing 4. The following are uses of Epidemiology, except:- a). Identifying aetiological agents an high risk groups b). Identifying natural history of a disease c). Identifying the intervention that are efficacious d). Isolating biological agents implicated in disease aetiology 5. A rate is characterized by all the following except a). It is a proportion that includes a specification of time b). It refers to instantaneous change in one quantity per unit change in another c). Maternal mortality ratio is a classic example d). The numerator is always part of the denominator
4
6. Sensitivity and specificity are a measure of one of the following: a). Reliability d) All the above b). Correlation e) None of the above c). Validity 7. Acceptable measures to describe the number of people who become sick after eating at the same restaurant on the same night are: Circle the most correct measure: a). Period prevalence b). Mortality index c). Attack rate d). Point prevalence ratio e). Crude death rate 8. The population at risk may refer to any of the following except: a). A population which is susceptible to developing the disease of interest b). Part of a population which is susceptible to developing the disease of interest c). Its accurate measurement can be affected by selective undercounting of population groups in a census d). The denominator used in calculating the maternal mortality rate Use the following information to answer questions 9 – 12. Dr. Kisitu is the DDHS of Wakiso District. An outbreak of Cholera occurred in Wakiso District in the month of November 2004. Dr. Kisitu found that 15 of the 20 households with cases did not have a latrine while 22 of the 30 controls in the study had a latrine in the home. 9. What type of study design did Dr. Kisitu employ? a)
Cohort b)
Cross-sectional c)
Case control d)
Clinical Trial e)
None of the above 10. What is the Odds Ratio for the association between cholera and absence of a latrine? a) 0.12 b) 1.5 c) 8.25 d) 0.67 11. Is the absence of a latrine, the cause of cholera? a) Yes b) No 12. If 6 of the 20 cases died, what is the case fatality rate? a) 60% b) 42.9% c) 30% d) 100% 13. In a case-control study of ovarian cancer, there were 235 cases and 451 controls. 40 cases and 118 controls reported that they had used oral contraceptives. The estimated risk (Odds ratio) of ovarian cancer associated with the use of contraceptives is:

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