TABLE 1.

Mean and SD of 10 Measurements of Residual Activity in 6 Different Types of Syringes

Syringe	Syringe capacity (mL)	Manufacturer	Brand	Residual activity (%)
				Mean	SD	P
Brand A	3 mL	Covidien	Monoject 3 cc	19.7	2.6	–
Brand B	3 mL	BD Medical	BD 3 cc	21.5	5.6	NS
Brand C	1 mL	Covidien	Monoject 1 cc insulin	17.5	3.2	NS
Brand D	1 mL	Covidien	Monoject 1 cc tuberculin	15.6	2.8	P < 0.01
Brand E	1 mL	Terumo Medical	Terumo 1 cc	13.1	3.0	P < 0.001
Brand F	3 mL	DPS Meditech	DPS 3 cc	11.4	3.6	P < 0.001

NS = not statistically significant.