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DE LA SALLE HEALTH SCIENCES INSTITUTE COLLEGE OF MEDICINE

DEPARTMENT OF FAMILY AND COMMUNITY MEDICINE

CM2 SY 2011-2012

REVISED OUTPUT 5: SAMPLE SIZE

SUBMITTED ON:

SEPTEMBER 13, 2011

SUBMITTED TO:

DR. JOVILIA M. ABONG

SUBMITTED BY:

GROUP 1A

ARCAIRA, JOSHUA A.

ABAD, RAINA

ANCHETA, JONATHAN B.

BASUL, CHARINE

CARAVEO, JULIEN NICOLE

CRUZ, SPICA

ESPINOZA, FAITH KRISTINE

GARCIA, RAY WILSON

KALALO, GERARD MICHAEL

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OUTPUT 5: SAMPLE SIZE

I. Group 1A, Dr. Jovilia M. Abong

II. Research Question: Among second year high school students with allergic rhinitis of selected schools

in Dasmarias, Cavite, will exposure to air-conditioned school rooms affect the severity of their

allergic rhinitis?

General Objective: To determine if the exposure to the air-conditioning system affects the severity

of allergic rhinitis in second year high school students of selected schools in Dasmarias, Cavite.

Specific Objectives:

1. To identify the prevalence of allergic rhinitis among second year high school students of

selected schools in of Dasmarias, Cavite based on their exposure to air-conditioned rooms.

2. To identify the prevalence of allergic rhinitis among second year high school students of

selected schools in Dasmarias, Cavite based on their exposure to non-air-conditioned

classrooms.3. To determine the severity of allergic rhinitis according to ARIA classifications.

4. To identify the risk factors of allergic rhinitis present in the classroom or school, such as the

presence of pollen, molds, and cockroaches.

5. Compare the severity of allergic rhinitis in students who are exposed to air-conditioned

classrooms and those who are not exposed to air-conditioned classrooms.

III. Research Design: Cross-Sectional Study

IV. Definition of variables used in the calculations

1. p1The p1 variable is the estimate of the sample population for the high school students who

study in air-conditioned classrooms that have mild allergic rhinitis.

2. p2The p2 variable is the estimate of the sample population for the high school students who

study in non-air-conditioned classrooms that have mild allergic rhinitis.

3. AlphaAlpha is the probability of committing a type I error, which means rejecting the null hypothesis

when in fact the null hypothesis is true. In the study, this is when results show that there is no

association between exposure to air-conditioning system and alleviation of severity of AR when

in fact there is.

4. BetaBeta is the probability of committing a type II error, which means retaining the null hypothesis

when the null is false. In the study, this is when we fail to reject the null hypothesis even if there

is sufficient evidence to state otherwise.

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5. Direction of TestThe study is a one tailed test because we are leaning towards the result of which air-conditioning

helps in alleviating the severity of AR.

V. Values

1. p1 = 30.72. p2 = 13.43. alpha = 0.954. beta = .80

The p1 and p2 values were based on the following study:

Mendell, M.J. & Smith, A.H. (1990). Consistent Pattern of Elevated Symptoms in Airconditioned Office

Buildings: A Reanalysis of Epidemiologic Studies.American Journal of Public Health. (80) 10.

VI. Sample Size

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APPENDIX

Excerpt from the study in which the values were obtained.