In a 2011 case series of 148 computer keyboard operators referred for nerve testing between 1995 and 1999, 105 had focal ulnar neuropathy at the elbow.

Checked against its source on October 17, 2026

In the source's own words

“Focal ulnar neuropathy at the elbow (UNE) was identified in 105 out of 148 CKOs referred to an EDX laboratory”

Ulnar neuropathy at the elbow in computer keyboard operators, Nahid K. Nainzadeh et al., Work (IOS Press), 2011, Abstract, Results.

What it measures: All 148 keyboard operators were referred to a nerve testing laboratory for suspected focal nerve problems in the upper limbs, mostly by private practice physicians, many of them hand surgeons, and an occupational medicine clinic. Each underwent nerve conduction studies of the upper limbs, including the ulnar nerve.
What it does not show: The people studied were referred patients with suspected nerve problems, not a random sample of typists, so the figure does not give the share of all keyboard users with elbow symptoms. The study does not measure how much or how long each person typed.