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Table 2 Cognitive test scores in the supplemented and placebo groups

From: Effect of multivitamin and multimineral supplementation on cognitive function in men and women aged 65 years and over: a randomised controlled trial

Participants Digit span forward scores Verbal fluency scores
   Baseline Mean (SD) 12 months Mean (SD) Supplemented vs. placebo Mean diff. (95% CI) Baseline Mean (SD) 12 months Mean (SD) Supplemented vs. placebo Mean diff. (95% CI)
All participants Supplemented 11.0 (2.2) (n 455) 11.5 (2.3) (n 398) -0.1 (-0.3, 0.2) 32.1 (12.0) (n 454) 33.8 (12.8) (n 397) 0.8 (-0.3, 2.0)
  Placebo 11.2 (2.2) (n 450) 11.7 (2.1) (n 374)   31.7 (12.8) (n 450) 33.0 (13.3) (n 372)  
Participants aged 75 years or over Supplemented 10.8 (2.2) (n 144) 11.1 (2.3) (n 123) -0.1 (-0.8, 0.6)1 30.0 (12.7) (n 143) 32.4 (13.0) (n 123) 2.8 (-0.6, 6.2)1
  Placebo 11.0 (2.1) (n 146) 11.3 (2.2) (n 105)   29.6 (12.5) (n 146) 30.0 (13.4) (n 103)  
Participants at increased risk of deficiency Supplemented 10.8 (2.1) (n 144) 11.2 (2.4) (n 113) 0.4 (-0.3, 1.1)1 29.2 (12.0) (n 144) 31.3 (13.1) (n 113) 2.5 (-1.0, 6.1)1
  Placebo 10.8 (2.2) (n 116) 10.9 (2.0) (n 91)   30.6 (13.9) (n 116) 29.2 (13.2) (n 91)  
  1. 1 Reflecting the fact that the analysis was carried out on a sub-group, a 99% confidence interval was used to give the correct width for the 95% confidence interval.