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Table 4 Within group effects of the decision aid

From: The impact of a decision aid about heart disease prevention on patients' discussions with their doctor and their plans for prevention: a pilot randomized trial

  Baseline
(n = 41)
Post-DA
(n = 41)
Absolute Difference
(95% CI)*
Effect on perception that CHD prevention requires a decision
Same way of lowering the chance of heart attack is right for everyone 40% 33% -7%
(-22% to 7%)
I am the only one who can decide how to best lower my chances of heart attack 30% 43% +13%
(-3% to 29%)
Effect on desire to participate in decision-making
Preferred participation in decision making about CHD:    
   I decide 15% 10% -5%
(-19% to 7%)
   I decide, consider MD opinion 32% 28% -5%
(-19% to 7%)
   Share decision 38% 38% 0%
(-15% to 15%)
   MD decides, considers my opinion 5% 10% +5%
(-7% to 19%)
   MD decides 8% 13% +5%
(-7% to 19%)
  1. * Exact binomial 95% confidence interval