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Studien visade att den relativa risken att dö i gruppen som fick intensiv behandling (systoliskt blodtryck under 120 mm Hg eftersträvat) jämfört med kontrollgruppen var 0.73 med 95% konfidensintervall = (0.6-0.9). Vad anger detta konfidensintervall och hur kan vi använda det för att avgöra om en eventuell skillnad är statistiskt signifikant?

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