A regression model evaluates the effect of obesity on obstructive sleep apnea severity in 250 adults (mean BMI 34 kg/m², apnea-hypopnea index 28 events/hour). Investigators include an obesity × sex interaction term because they suspect the association differs between men and women. Polysomnography confirmed moderate OSA in all participants. No patients used CPAP therapy. Which statistical result would provide the strongest evidence for effect modification by sex?
- A)A narrow confidence interval for the intercept
- B)A significant interaction term for obesity × sexGABARITO
- C)A large sample size
- D)A significant coefficient for obesity alone
- E)A significant coefficient for sex alone
Explicação
A significant interaction term indicates that the relationship between obesity and sleep apnea severity differs according to sex. This is the formal regression based test for effect modification. Main effect coefficients alone do not show whether the obesity e... Ver explicação completa e trilha adaptativa →