Cross sectional studies in epidemiology - Definition, advantages and disadvantages

University:
Johns Hopkins University
Course:
ME.250.699. | Medicine Elective
Academic year:

2023
Views:

178

Pages:

2
Author:

Yasin N.

CROSS-SECTIONAL STUDY Studies bored on data gathered for os sporije point iss tro Stuary population Selected at Pernod & tim a point trim / • Representatiu scomples Hecken out git buith sompling metrock.. slept 4 Identyy the expored and unexposed. • Perevaleme gals and and unenposed non dueared com be Jound amony exposed Design Slady popertation Eg:. Representative Sommple. Dis Erysosed D/3 Not exposed. EXP No A No etp.. • Mecuenes prenademes, not incideme gells, ie number 9 ad and time. new cerver at a particular point / penoil y • Exposwas and outcome cookit. - Boved on single onemination 9 cross section o population at otopoints and arcatto g. sample one applied to white populabres. Advantage Give shapshot g a population 4 Perevalene g dls. Useful jos Chnowi dls • Show patlem g dls. Quick, eauy, Len exponins Describe magnitude & chithbut I health prin Cidis burden) • Generatizable uneth 4 popul boud sanele. • Used to prove/dispwoni hypathion/anupth/cwale now their Disadvantage . Coinuent crued to analyse outcome Our a period I tince • Tells ditsribution og als srather thom etiology, which Cominot be confirmed loathol establis Himi Comnot establins causalitity as dossi Sequence. • Nataliquate jor grave dislexposure (need longe savvyple size) Measure gans creation •Risk Probability that an event would happen. -Risk joctor -A Charactenilen / factor that inghemes whether on not an enerd occurs • Asscination blw Re (Exposure) and onlcome (alls) com be investigated wing analytical cobervational studys. • The Treguemy & dls in group one gup. as compound to omother meed to be found. 22 table presented in the formy. Exposure Statun Disene status Totel Yes Yes a No. b ath C atc Total d b+d atbicad. Prevalence i27 the exposed popislation - a e atb. R hon-exposed Ro. 7 Prevalons in total populitres atc e cit b+c+d. RT. A Heribertable grisk (AR), Rük dyjereme the 1 or te in the erik (or mate) AR is deyined as a dls in the exposed group that is atributableما emposme. AR RE-RO

Cross sectional studies in epidemiology - Definition, advantages and disadvantages

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