Table 1.

Guidelines for rounding P values

P Value RangeRounding Precision
0.01 ≤ P ≤ 1.00Round to 2 decimal places: round P = 0.024 to P = 0.02.
0.001 ≤ P ≤ 0.009Round to 3 decimal places: round P = 0.0048 to P = 0.005.
P < 0.001Report as P < 0.001.
  • Adapted with permission from Ref. 7.