statistics Roland Brey, Public health office Amberg (Germany) 15 November 2004 I was surprised to see Risk Ratios instead of Odds Ratios. Is this really statistically correct?"A total of 162 (17.2 %) of 942 patients visiting the ER during the outbreakperiod had acute gastroenteritis. Compared with 85 (9.7%) of 872 patients in theweek before the outbreak, significantly higher percentages of patients withgastroenteritis were observed in the outbreak week (Relative risk (RR): 1.92, 95%confidence interval (CI): 1.38 – 2.26, P < 0.001)."Either the value for the risk ratio or the confidence interval may not be correct.I found following ratios:Odds ratio: 1,92 [1,45; 2,55]Risk ratio: 1,76 [1,38; 2,26] Competing interests None declared
statistics
15 November 2004
I was surprised to see Risk Ratios instead of
Odds Ratios. Is this really statistically correct?
"A total of 162 (17.2 %) of 942 patients visiting the ER during the outbreak
period had acute gastroenteritis. Compared with 85 (9.7%) of 872 patients in the
week before the outbreak, significantly higher percentages of patients with
gastroenteritis were observed in the outbreak week (Relative risk (RR): 1.92, 95%
confidence interval (CI): 1.38 – 2.26, P < 0.001)."
Either the value for the risk ratio or the confidence interval may not be correct.I found following ratios:
Odds ratio: 1,92 [1,45; 2,55]
Risk ratio: 1,76 [1,38; 2,26]
Competing interests
None declared