Table 4 Variables associated with greater frequencies or intensity of pain or stiffness over time determined through multivariable analysis

Musculoskeletal stiffness, pain or injury in past 12 months

653 of 901 responses (72%)

2.16 [1.52, 3.08], <0.001

1.01 [1.00, 1.01], 0.003

Low back pain or stiffness in past 4 weeks^a

427 of 865 responses (49%)^a

Low back pain as measured with the VAS^b

948 of 948 responses (100%)^a

1.48 [1.07, 2.01], 0.018