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Table 3 Cox proportional hazards model (Cox Regression) for analysis of effect of ROX Index ≥12.85 on SO at days 2, 4 and 7 and severity scores

From: The ROX index as a predictor of standard oxygen therapy outcomes in thoracic trauma

  HR 95%CI P-value
Unadjusted ROX index ≥12.85
 At day 2 0.03 0.009–0.095 <  0.0001
 At day 4 0.06 0.025–0.129 <  0.0001
 At day 7 0.06 0.027–0.129 <  0.0001
Adjusted by ISS
 At day 2 0.03 0.010–0.106 <  0.0001
 At day 4 0.06 0.034–0.141 <  0.0001
 At day 7 0.06 0.029–0.137 <  0.0001
Adjusted by AIS thorax
 At day 2 0.03 0.010–0.106 <  0.0001
 At day 4 0.06 0.027–0.139 <  0.0001
 At day 7 0.06 0.029–0.136 <  0.0001
Adjusted by TTSS
 At day 2 0.04 0.012–0.142 <  0.0001
 At day 4 0.07 0.034–0.187 <  0.0001
 At day 7 0.08 0.036–0.182 <  0.0001
Adjusted by SAPS II
 At day 2 0.04 0.013–0.146 <  0.0001
 At day 4 0.08 0.034–0.190 <  0.0001
 At day 7 0.06 0.029–0.136 <  0.0001
  1. ISS Injury severity score; AIS Abbreviated injury scale; TTSS Thoracic trauma severity score; SAPS II Simplified acute physiology score II