Which of the following point estimates can be said to represent a positive, nega

Question

Which of the following point estimates can be said to represent a positive, negative, no association, and/or inconclusive study? (Hint:   An estimate could be noted as positive, negative, or null and as inconclusive.)

RR=1.0   95%CI (0.9 – 1.1)      _______________

RR=1.0   95%CI (0.1 – 10.0)    _______________

RR=0.5   95%CI (0.4 – 0.7)      _______________

RR=0.5   95%CI (0.1 – 3.0)      _______________

RR=5.0   95%CI (0.9 – 50.0)    _______________

RR=5.0   95%CI (3.7 – 6.8)      _______________

RR=1.0   95%CI (0.5 – 2.0)      _______________

RR=5.0   95%CI (1.2 – 30.5)    _______________

Explanation / Answer

RR=1.0   95%CI (0.9 – 1.1) : No Association (Confidence interval includes null value and RR is 1

RR=1.0   95%CI (0.1 – 10.0) : No Association (Confidence interval includes null value)

RR=0.5   95%CI (0.4 – 0.7) : Negative Association (Confidence interval does not include the null value (RR-1) and RR is less than 1

RR=0.5   95%CI (0.1 – 3.0) : No Association (Confidence interval includes null value)

RR=5.0   95%CI (0.9 – 50.0) : Inconclusive Association (Lower limit of CI is close to null value, if lower limit would have cross the 1 value then it may turned to be positive association.

RR=5.0   95%CI (3.7 – 6.8) : Positive Association (Confidence interval does not include the null value and RR higher than 1

RR=1.0   95%CI (0.5 – 2.0) : No Association (Confidence interval includes null value)

RR=5.0   95%CI (1.2 – 30.5) : Positive Association (Confidence interval does not include the null value (RR-1) and RR is more than 1

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