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Table 2 NIRS variables during the vascular occlusion tests.

From: 500 ml of blood loss does not decrease non-invasive tissue oxygen saturation (StO2) as measured by near infrared spectroscopy - A hypothesis generating pilot study in healthy adult women

Blood donors Before blood donation After blood donation  
  median IQR median IQR two-tailed p-value
StO2 rate of decrease(%/sec) -0.19 -0.21 - -0.16 -0.19 -0.23 - -0.15 0.78
StO2 rate of recovery (%/sec) 3.04 2.57 - 3.45 3.29 2.79 - 3.48 0.25
StO2 delta (%) 14.0 12.0 - 15.8 13.5 12.0 - 18.0 0.36
O2Hb rate of decrease (/sec) -0.033 -0.043 - -0.026 -0.027 -0.055 - -0.021 0.98
O2Hb rate of recovery (/sec) 0.59 0.50 - 0.72 0.63 0.48 - 0.74 0.59
O2Hb delta 4.33 3.47 - 4.97 4.76 4.24 - 5.42 0.06
Control Before rest period After rest period (19 minutes)  
  median IQR median IQR two-tailed p-value
StO2 rate of decrease (%/sec) -0.17 -0.19 - -0.15 -0.15 -0.20 - -0.12 0.43
StO2 rate of recovery (%/sec) 2.64 2.00 - 2.88 2.43 2.00 - 3.47 0.29
StO2 delta (%) 12.5 11.3 - 13.3 13.5 11.5 - 15.25 0.10
O2Hb rate of decrease (/sec) -0.039 -0.051 - -0.026 -0.031 -0.046 - -0.020 <0.01*
O2Hb rate of recovery (/sec) 0.49 0.39 - 0.63 0.54 0.39 - 0.69 <0.05*
O2Hb delta 3.88 2.43 - 4.20 4.00 3.32 - 5.72 <0.01*
  1. IQR: interquartile range, *: p < 0.05