Table 3 Difference of Hb of two readings.

From: Estimation of haemoglobin using non-invasive portable device with spectroscopic signal application

Difference of Hb

Frequency

Percentage

 < 0.5

86

61.4%

0.5–1

32

22.9%

1.1–1.5

10

7.1%

1.6–2

10

7.1%

 > 2

2

1.4%

Total

140

100%