Because of small sample sizes, only univariate statistical analyses were used in the case-control studies.
Six cohort studies and three case-control studies were included in the present study.
Sample size is an important factor in case-control studies, mainly in investigations of genetic polymorphisms with high frequency in the general population.
El tamaño de la muestra es un factor importante en estudios de caso-control, principalmente en investigaciones de polimorfismos genéticos con alta frecuencia en la población en general.
Hooked on Evidence includes clinical trials, cohort studies, case-control studies, case reports, single-subject experimental designs and cross-sectional studies.
Centrada en la evidencia Incluye ensayos clínicos, estudios de cohortes, estudios de caso-control, casos clínicos, diseños experimentales o estudios transversales.
The necessary data can be sought in case-control studies.
At present, available epidemiological evidence from case-control studies on nitrite and nitrosamine intake supports a positive association with gastric cancer risk.
Hasta el presente, las evidencias epidemiológicas disponibles a partir de estudios de control de casos sobre la ingesta de nitritos y nitrosaminas confirma una asociación positiva con el riesgo de cáncer gástrico.
Analysis of nested case-control studies[edit]
Ventajas de los estudios de casos y controles[editar]
Excessive salt intake has been identified as a possible risk factor for gastric cancer in correlation and case-control studies.
El consumo excesivo de sal se identificó como un posible factor de riesgo de cáncer gástrico en correlación y en estudios de casos y controles.
Six case-control studies and two cohort studies have explored potential dietary risk factors for colorectal adenomas.
Seis estudios de casos y controles y dos estudios de cohortes exploraron presuntos factores de riesgo alimentarios por adenomas colorrectales.
Most have been case-control studies, which have relied on people's memories about their past cell phone use.
Thus, more research is needed to address long-term exposure, as well as diseases other than those included in the ongoing case-control studies .
Por consiguiente, se necesita más investigación para tratar la exposición a largo plazo, así como enfermedades que no son las incluidas en los estudios de control de casos en curso actualmente .
Level 3 evidence is systematically reviewed case-control studies.
La evidencia de nivel 3 consiste en estudios de casos y controles.
The primary studies identified were case-series studies, non-randomized intervention studies, and case-control studies.
Los estudios primarios localizados son series de casos, estudios de intervención no aleatorizados y estudios de casos y controles.