Carpal Tunnel Statistics
•If you type 40 words a minute: you press 12,000 keys per hour or 96,000 keys per 8-hour day.
•Approximately 8 ounces of force is necessary to depress one key.
•Almost 16 tons of force will be exercised by your fingers.
•Note for computer users and typists: Repetitive typing and key entry is highly associated with missing work due to CTS. The risk for CTS in this group, however, is still much lower than with occupations involving heavy labor.
•One 2001 study reported that nerve conduction tests on frequent computer users showed the same rate of CTS (3.5%) as in the general population.
•However, 10% of the computer users complained of CTS symptoms and 30% reported tingling and burning in the hand.
•The typing speed may affect risk. For example, the fingers of typists whose speed is 60 words per minute exert up to 25 tons of pressure each day.
•And in one, study typists with CTS struck the keys with greater force than those without the disorder did.