Table 4 Risk factors for no-symptoms, and five leading five symptoms in a univariate model

No symptom

 Odds ratio

1.23

1.04

1

1.01

1

0.73

1

0.60

1.16

 95% CI

0.69–2.19

0.54–2.01

0.99–1.03

0.46–1.17

0.33–1.07

0.66–2.02

 P

0.48

0.9

0.287

0.195

0.083

0.607

Spinal pain

 Odds ratio

1.05

1.05

1

1.01

1

0.73

1

0.96

1.04

 95% CI

0.55–1.99

0.51–2.18

0.99–1.04

0.44–1.24

0.51–1.79

0.56–1.95

 P

0.893

0.892

0.255

0.247

0.894

0.893

Respiratory

 Odds ratio

0.91

0.74

1

0.98

1

1.67

1

1.80

1.14

 95% CI

0.47–1.74

0.35–1.59

0.96–1.01

0.96–2.93

0.96–3.36

0.58–2.26

 P

0.768

0.441

0.214

0.071

0.065

0.707

Fatigue

 Odds ratio

1.30

1.10

1

0.93

1

4.31

1

1.15

0.72

 95% CI

0.65–2.59

0.50–2.43

0.90–0.96

2.18–8.51

0.61–2.16

0.36–1.47

 P

0.462

0.809

<0.001

<0.001

0.670

0.368

Headache

 Odds ratio

0.88

1.39

1

0.98

1

1.07

1

1.53

0.69

 95% CI

0.36–2.19

0.54–3.62

0.94–1.01

0.52–2.18

0.70–3.33

0.26–1.82

 P

0.788

0.497

0.173

0.855

0.285

0.448

Weakness

 Odds ratio

0.62

0.88

1

0.89

1

16.93

1

1.71

1.28

 95% CI

0.21–1.85

0.27–2.86

0.83–0.95

2.24–128.23

0.60–4.91

0.40–4.04

 P

0.387

0.834

0.001

0.006

0.315

0.678