Slow typists' average gap between keystrokes was at least about four times the fast typists' gap, since slow typists averaged over 480 milliseconds and fast typists about 120.

Checked against its source on October 16, 2026

What it measures: The ratio is computed from the two averages reported in the same paper: about 120 ms for fast typists and over 480 ms for slow typists.
How it is calculated: 480 / 120 = 4.0, a lower bound because the slow figure is 'over 480 ms'
What it does not show: A lower bound, because the slow figure is stated as over 480 ms.

Calculated from