Statistics should be reported at the same level of precision as the measurements (not at a higher level). For example, the mean age of participants in a study (in years) should be reported to a maximum of 1 decimal place. Reporting the mean to 2 or 3 decimal places could imply that ages were determined at the level of days, or even hours, rather than just years.

Percentages should also be reported using a sensible level of precision. If the number of people in a sample is below 100, reporting that 15.32%, or even 15.3%, of them were affected by a treatment is not reasonable; the percentage should be given as a whole number (15%).