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Table 2: Long-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 64 9 13 86
    Steroid 46 16 18 80
    Total 110 25 31 166 χ² = 5.51
Patients without disk disease 
    O₂–O₃ 53 11 6 70
    Steroid 44 11 15 70
    Total 97 22 21 140 χ² = 4.68

Treatment Group	Outcome
Treatment Group	Excellent	Good	Poor	Total
Patients with disk disease
O₂–O₃	64	9	13	86
Steroid	46	16	18	80
Total	110	25	31	166 χ² = 5.51
Patients without disk disease
O₂–O₃	53	11	6	70
Steroid	44	11	15	70
Total	97	22	21	140 χ² = 4.68