Table 3.

The five variables forming the clinical prediction rule and the number of subjects in each group at each level

Number of predictors present	Success with cervical traction (% of pts)	Non-success with cervical traction (% of pts)	Total patients (% of pts)
≥4	9 (13.2)	0	9 (13.2)
≥3	10 (14.7)	5 (7.4)	15 (22.1)
≥2	6 (8.8)	17 (25)	23 (33.8)
≥1	4 (5.8)	10 (14.7)	14 (20.6)
0	1 (1.5)	6 (8.8)	7 (10.3)

Age ≥55

Positive shoulder abduction test

Positive ULTT A

Symptom peripheralization with central posterior–anterior motion testing at lower cervical (C4–7) spine

Positive neck distraction test