Table 2.

Comparison between different source detector distances

Time (min)	Time to increase SD1	Time to increase SD3	P-value	BFISD1	BFISD3	P-value
−30	12.7 (±1.64)	11.7 (±1.67)	<0.01	0.0353 (±0.0151)	0.118 (±0.0398)	<0.01
−15	13.9 (±0.995)	12.9 (±1.22)	<0.01	0.0363 (±0.0153)	0.107 (±0.0234)	<0.01
0	13.3 (±1.37)	12.4 (±1.25)	<0.01	0.0331 (±0.0151)	0.103 (±0.0236)	<0.01
15	13.2 (±1.23)	12.0 (±1.78)	<0.01	0.0377 (±0.0192)	0.107 (±0.0320)	<0.01
30	13.5 (±1.06)	12.2 (±1.19)	<0.01	0.0361 (±0.0199)	0.0971 (±0.0243)	<0.01
45	13.7 (±1.91)	12.6 (±1.93)	<0.01	0.0459 (±0.0307)	0.123 (±0.0445)	<0.01
60	11.8 (±4.42)	10.8 (±4.08)	<0.01	0.0363 (±0.0135)	0.0987 (±0.0295)	<0.01

Time to increase (s) and BFI (OD/s) in source detector pairs of 1 cm (SD1) compared to the source detector pairs of 3 cm (SD3). Variables are displayed ± SD.

BFI, blood flow index; OD/s, optical density per second.