Table 1.

Patients’ characteristics

	Number	Mean (range)
Age (years)		51 (32–69)
Male/female	37/13
Duration of symptoms (months)
Recent onset		1.8 (0.25–6)
<2	40
2–12	10
Remote onset		27.3 (1.5–240)
<12	30
12–36	7
>36	13
Symptoms (%)
Nuchal pain	62
Shoulder pain	66
Radicular pain	76
Paresthesia	82
Signs (%)
Sensory loss	42
Motor weakness	36
Decreased reflex	36
Smoking (%)
Yes/no/missing	38/52/10
Location (R/L)	21/29
Operated levels (1-/2-)	37/13	1.34
C4–C5	8
C5–C6	29
C6–C7	27
C7–T1	3