Table 2 Relationship between muscle strength and back and arthralgia

Low back pain

P

Arthralgia

P

Crude

0.99 (0.98–1)

0.371

0.97 (0.96–0.98)

< 0.001

Model 1^a

1 (0.99–1.01)

0.744

0.98 (0.97–0.99)

0.012

Model 2^b

1 (0.98–1.01)

0.796

0.98 (0.97–0.99)

0.008

Crude

Back stiffness

P

Joint stiffness

P

Model 1^a

0.97 (0.95–0.99)

0.013

0.95 (0.93–0.98)

0.002

Model 2^b

0.98 (0.96–1)

0.098

0.97 (0.94–1)

0.077

0.97 (0.95–0.99)

0.048

0.96 (0.93–0.99)

0.049