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Table 2: 
Multivariate analysis determining the predictors of futile recanalization
VariableOR (95% CI)P Value for DifferenceP Value for Trend
Age strataN/A
    ≤70 yearsReference
    >70 years4.4 (1.9–10.5).0008
NIHSS score strata<.0001
    0–9Reference
    10–193.8 (1.7–8.4).001
    ≥2064.4 (28.8–144.4)<.0001
Time to treatment strata.38
    ≤3 hoursReference
    3–6 hours2.5 (1.3–4.8).0049
    >6 hours1.3 (0.8–2.2).27
Occlusion severity strata (Qureshi: grade)N/A
    Mild (grade 0–2)Reference
    Severe (grade 3–5)0.4 (0.1–2.6).37