Table 4. Comparison of pain experience (in %) 24 hours after injection between the different systems as determined by VAS .

Systems used	No pain	Mild pain	Moderate pain	Intergroup comparison
Self-aspirating syringe (SAS)	90	10	0	SAS vs. CS P=0.019*
Conventional syringe (CS)	63.3	16.7	20	SAS vs. CCLADS P=1.000
Computer-controlled device (CCLADS)	90	10	0	CS vs. CCLADS P=0.019*

Mann-Whitney test; * indicates significant at P≤0.05