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Table 2 Prevalence of NHST and CI across periods, languages and research areas.

From: The null hypothesis significance test in health sciences research (1995-2006): statistical analysis and interpretation

   Total of papers P-values and no CI   CI and P-values   CI and no P-values
    n % (95%CI)   n % (95%CI)   n % (95%CI)
Period 1995-1996 285 119 41 (35 to 47)   138 49 (43 to 55)   28 10 (6 to13)
  2000-2001 278 101 38 (31 to 44)   150 51 (44 to 58)   27 11 (6 to 15)
  2005-2006 306 65 21 (16 to 26)   198 65 (59 to 71)   43 14 (9 to 17)
Language Spanish 396 156 39 (34 to 43)   211 54 (49 to 59)   29 7 (5 to 10)
  English 473 129 32 (28 to 36)   275 55 (51 to 60)   69 12 (10 to 15)
Area Clinical 300 166 52 (45 to 58)   125 45 (39 to 51)   9 3 (1 to 6)
  General Medicine 278 69 22 (17 to 27)   170 61 (55 to 67)   39 17 (12 to 22)
  Public Health and Epidemiology 291 50 18 (13 to 23)   191 65 (59 to 71)   50 17 (13 to 22)
  1. CI: Confidence Interval