Table 1 Definitions and corresponding prevalence of musculoskeletal problems in the neck-shoulder region among all VDU users (n = 627)

Questionnaire

Primary definition : Presence of symptoms for at least 3 days during the last 7 days, with worst pain intensity greater than 50 mm on the 100 mm VAS scale.

Limitations in activities of daily living : Primary definition and a score equal or greater than 2 on the functional limitations scale.

Limitations in work activities : Primary definition and limited work activities.*

Limitations in household activities : Primary definition and limited household activities.*

Limitations in leisure activities : Primary definition and limited leisure activities.*

Physical examination

Primary definition: any one of the following three :

• Diminution ≥ 30% of the normal active range of motion (American Academy of Orthopaedic Surgeons, 1966);

• Diminution of normal muscular strength (score ≤ 4 on the Lovett scale) (Daniels, 1995);

• Pain of moderate intensity or worse (≥ 3 on the 11-point Numerical Rating Scale) produced at the relevant site during any maneuver.

Definition based solely on decreased range of motion or muscle strength : One of the following two :

• Diminution ≥ 30% of the normal active range of motion (American Academy of Orthopaedic Surgeons, 1966);

• Diminution of normal muscular strength (score ≤ 4 on the Lovett scale) (Daniels, 1995).

Definition based solely on pain manifested during maneuvers :

• Pain of moderate intensity or worse (≥ 3 on the 11-point Numerical Rating Scale) produced at the relevant site during any maneuver.