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Table 5 Summary of the different formats for numerical rating scales used across all 228 clinical trials. These are used to assess a wide range of domains including tinnitus loudness annoyance, awareness, distress and tinnitus-related quality of life

From: Systematic review of outcome domains and instruments used in clinical trials of tinnitus treatments in adults

  Primary outcome instruments Secondary outcome instruments
  Number Percentage (%) Number Percentage (%)
Numerical rating scale (0–3) 1 0 % 0 -
Numerical rating scale (0–10) 49 10 % 18 3 %
Numerical rating scale (0–100) 18 4 % 13 2 %
Numerical rating scale (1–9) 0 - 1 0 %
Numerical rating scale (1–10) 12 2 % 0 -
Numerical rating scale (1–100) 1 0 % 0 -
Numerical rating scale (4 points) 3 1 % 2 0 %
Numerical rating scale (5 points) 2 0 % 2 0 %
Numerical rating scale (7 points) 3 1 % 0 -
Numerical rating scale (10 points) 0 - 1 0 %
Numerical rating scale (10-cm line) 5 1 % 14 2 %