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Table 1 Negative articles addressing power/sample size and confidence intervals

From: Prominent medical journals often provide insufficient information to assess the validity of studies with negative results

Journal Power/Sample Size* Confidence Intervals† Power/Sample Size and Confidence Intervals*
  n (%, 95% CI)
Annals 6/41 (15, 3–26) 33/41 (80, 68–93) 5/41 (12, 2–23)
BMJ 11/57 (19, 9–30) 46/57 (81, 70–91) 10/57 (18, 7–28)
JAMA 10/44 (23, 10–36) 24/44 (55, 39–70) 3/44 (7, 0–15)
Lancet 24/46 (52, 37–67) 34/46 (74, 61–87) 20/46 (43, 29–58)
NEJM 19/46 (41, 27–56) 34/46 (74, 61–87) 13/46 (28, 15–42)
Total 70/234 (30, 24–36) 171/234 (73, 67–79) 51/234 (22, 16–27)
  1. * P < 0.001 † P = 0.038