Table 2.

Attribute data for the 434 human volunteers enrolled in the tissue hemoglobin index range study

Characteristic	Value	Tissue hemoglobin index	Tissue hemoglobin oxygen saturation (%)
Posture		*	*
Sitting reclined	271	13.9 ± 1.55	83.3 ± 4.01
Sitting upright	163	14.4 ± 1.62	78.3 ± 5.57
Gender			*
Male	235	14.1 ± 1.58	83.3 ± 4.29
Female	199	14.1 ± 1.63	79.3 ± 5.47
Age (years)	42.3 ± 10.7
Ethnicity
White	410	14.1 ± 1.62	81.4 ± 5.30
Other	11	13.5 ± 0.82	81.9 ± 3.14
Hispanic	6	14.3 ± 1.37	85.1 ± 6.19
Indian	6	12.9 ± 1.02	80.4 ± 2.86
Black	1	12.4 ± na	78.0 ± na
Smoker		*
No	392	14.7 ± 1.39	81.5 ± 5.25
Yes	42	14.0 ± 1.61	81.3 ± 5.35
Hours last smoked	4.4 ± 5.1
Dominant hand measured
Yes	395	14.1 ± 1.61	81.4 ± 5.35
No	39	13.9 ± 1.47	82.2 ± 4.04

Data presented as number of subjects or mean ± standard deviation. Posture and smoking habit influenced the tissue hemoglobin index.

*Characteristic parameter had a statistically significant effect, P < 0.05. na, not applicable.