Table 2 Crude and adjusted longitudinal Poisson regression analyzes of LBP experience. Rio Grande do Sul, Brazil. 2020

Crude

Model 1

PR (95% CI)

p-value

PR (95% CI)

p-value

Gender

 < 0.001

 < 0.001

  Male

1.00

1.00

  Female

1.15 (1.09; 1.22)

1.16 (1.10; 1.23)

Age group

0.884

0.413

  18–30

1.00

1.00

  31–59

0.96 (87.4; 1.05)

1.01 (0.96; 1.06)

  60 + 

0.99 (0.95; 1.03)

0.93 (0.85; 1.02)

Educational level

0.046

0.029

  High school or less

1.00

1.00

  University degree

0.90 (0.85; 0.95)

0.91 (0.86; 0.97)

  Postgraduate

0.92 (0.87; 0.97)

0.92 (0.87; 0.97)

BMI*

 < 0.001

 < 0.001

  Normal

1.00

1.00

  Overweight

1.12 (1.07; 1.17)

1.13 (1.08; 1.18)

  Obese

1.11 (1.05; 1.17)

1.10 (1.04; 1.16)

Chronic disease

 < 0.001

 < 0.001

  No

1.00

1.00

  Yes

1.15 (1.10; 1.19)

1.12 (1.07; 1.17)

Commitment to social distancing

0.377

0.1834^a

0.138

0.0889^a

  Low

1.00

1.00

  Medium

0.93 (0.86; 1.01)

0.92 (0.85; 1.00)

  High

0.95 (0.88; 1.01)

0.93 (0.86; 1.00)

Model 2

Anxiety

 < 0.001

 < 0.001

  Sustained/Better

1.00

1.00

  Worse

1.07 (1.05; 1.09)

1.06 (1.04; 1.08)

Model 3

Depression

 < 0.001

 < 0.001

  Sustained/Better

1.00

1.00

  Worse

1.06 (1.03;1.08)

1.04 (1.02; 1.07)

Model 4

Physical activity

0.0313^a

0.7289^a

  Sustained active

1.00

1.00

  Sustained inactive

1.09 (1.02; 1.16)

1.03 (0.96; 1.09)

  Become inactive

1.04 (0.97; 1.11)

1.01 (0.94; 1.09)

  Become active

1.04 (0.95; 1.14)

0.99 (0.90; 1.08)