Table 1.

Syringe and needle materials investigated.

Syringes (manufacturer)	1 mL polycarbonate (Becton, Dickinson and Company, New Jersey, USA)	1 mL Monojet polypropylene (Tyco Healthcare Group, Massachusetts, USA)	1 mL Tuberculin polypropylene (Becton, Dickinson and Company, New Jersey, USA)	3 mL polypropylene (Becton, Dickinson and Company, New Jersey, USA)	5 mL polypropylene (Becton, Dickinson and Company, New Jersey, USA)
Needle lengths and gauges (manufacturer)	16 mm, 25 G BD Eclipse needles (Becton, Dickinson and Company, New Jersey, USA)	25 mm, 25 G BD Eclipse needles (Becton, Dickinson and Company, New Jersey, USA)	38 mm, 25 G BD Eclipse needles (Becton, Dickinson and Company, New Jersey, USA)	13 mm, 27 G BD Eclipse needles (Becton, Dickinson and Company, New Jersey, USA)	13 mm, 30 G BD Eclipse needles (Becton, Dickinson and Company, New Jersey, USA)