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Table 3 Jadad score by time and impact factor

From: Over 50 years of trial in Acta Psychiatrica Scandinavica: a survey

   Jadad score
   0–2 3–5 (good quality)
  Impact factor N N % 95% CI
1950s - 7 0 - -
1960s - 16 5 23.8 11–45
1970s - 91 59 39.3 32–47
1980s - 149 97 39.4 34–46
1990s 1.3–1.7 70 56 44.4 36–53
2000–6 1.7–2.4 20 12 37.5 23–55
Totals   353 229 39.3 35–43