| Preoperative | 6 months | 2 years |
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OPEN-TLIF BDS | 3 (2–7) | 2 (1–4) | 1 (0–3) |
MMI-TLIF BDS | 3 (2–6) | 2 (0–5) | 1 (0–3) |
OPEN-TLIF NSS | 4 (3–6) | 2 (1–4) | 1 (0–4) |
MMI-TLIF NSS | 3 (2–5) | 2 (0–4) | 1 (0–2) |
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BDS back pain and disability score, NSS neurogenic symptom score, MMI-TLIF modified minimally invasive transforaminal lumbar interbody fusion, Open-TLIF open transforaminal lumbar interbody fusion
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P < 0.01 when preoperation compared to 6 month and 2 years, respectively in both MMI-TLIF and open-TLIF groups of BDS and NSS
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P > 0.05 when 6 months compared to 2 years in both MMI-TLIF and open-TLIF groups of BDS
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P < 0.01 when 6 months compared to 2 years in both MMI-TLIF and open-TLIF groups of NSS
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P > 0.05 when OPEN compared to MMI-TLIF in preoperation, 6 months and 2 years of BDS and NSS