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Table 1: Medium-term follow-up in patients with and without disk disease as a function of treatment type
Treatment Group Outcome
Excellent Good Poor Total
Patients with disk disease 
    O₂–O₃ 67 9 10 86
    Steroid 54 14 12 80
    Total 121 23 22 166 χ² = 2.42
Patients without disk disease 
    O₂–O₃ 55 9 6 70
    Steroid 49 10 11 70
    Total 104 19 17 140 χ² = 1.86

Treatment Group	Outcome
Treatment Group	Excellent	Good	Poor	Total
Patients with disk disease
O₂–O₃	67	9	10	86
Steroid	54	14	12	80
Total	121	23	22	166 χ² = 2.42
Patients without disk disease
O₂–O₃	55	9	6	70
Steroid	49	10	11	70
Total	104	19	17	140 χ² = 1.86