Table 5: Variables potentially affecting the FAST sum score.

Univariable regression
coefficient [95% CI] 		p
Age (per +10 years) 0.86 [0.60-1.25] 0.42
Female sex 1.26 [0.61-2.58] 0.52
Depression2 1.81 [0.67-4.93] 0.23
Chronic back pain2 2.58 [1.19-5.59] 0.02
PHQ-9 (per +1 point)1 1.12 [1.02-1.21] 0.02
GAD-7 (per +1 point)1 1.21 [1.08-1.37] <0.01
SF-12 physical sub-scale3 (per +5 points4) 0.91 [0.72-1.16] 0.45
SF-12 mental sub-scale3 (per +5 points4) 0.74 [0.63-0.87] <0.01
- Stepwise backwards
regression coefficient [95% CI] 		p
SF-12 mental sub-scale2 (per +5 points) 0.76 [0.66-0.88] <0.01
Chronic back pain3 2.30 [1.17-4.54] 0.02
Stepwise excluded variables: PHQ-9 (p=0.68), GAD-7 (p=0.72)R2 for final model 0.53, corrected R2 0.48

Data derived from regression analysis with (ln (1 + sum score self-assessed FAST) as dependent variable.
1 Higher values on the scale indicate a higher burden of symptoms of depression (PHQ-9), anxiety (GAD-7), or more difficulties in performing instrumental activities of daily living (FAST).
2 Recorded at any time in the medical history of the participant.
3 Higher values on the scale indicate the better health-related quality of life
4 Since the SF-12 score has a wide range, we chose steps of 5 points to calculate regression coefficients.