The Effects of Sample Transport by Pneumatic Tube System on Routine Hematology and Coagulation Tests

Table 2

Summary of the differences in PT and APTT between pneumatic tube samples and hand delivered samples.

S. no.	Paired samples	Mean difference	Standard deviation	95% confidence interval of mean difference		P value
				Lower	Upper
1	PT P-PT M (secs)	-.38	1.3	-.95	.18	.17
2	APTT P-APTT M (secs)	-.33	3.5	-1.7	1.1	.63

P: pneumatic tube samples; M: hand delivered samples; PT: prothrombin time; APTT: activated partial thromboplastin time.