Table 2.

Effect of free-fall test and static load test on safety cap removal force

	Sample number (n)	Mean ± SD cap removal force (N)	P-value
Without preconditioning – standard conditions (control)
Syringe AAI – protection cap	20	16.58 ± 5.86	–
Syringe AAI – safety cap	15	20.23 ± 6.61	–
Cartridge AAI – safety cap	15	9.56 ± 2.36	P < 0.001 versus syringe AAI – safety cap
Preconditioning – free-fall test
Syringe AAI – safety cap	15	21.07 ± 1.19	P = 0.690 versus control
Cartridge AAI – safety cap	15	9.98 ± 0.68	P = 0.653 versus control
Preconditioning – static load test
Syringe AAI – safety cap	15	18.89 ± 2.203	P = 0.633 versus control
Cartridge AAI – safety cap	15	38.39 ± 1.458	P < 0.001 versus control