Table 4.

Influence of relevant factors on absolute pain reduction 30 min after ultrasound-guided regional anesthesia

Factors	Mean difference	95% CI	p value
t test
Gender (male, female)	− 0.03	− 1.48–1.42	0.97
Laterality (left, right)	− 0.55	− 1.95–0.85	0.43
Prehospital analgesics (no, yes)	0.96	− 3.56–5.47	0.57
Block type (femoral nerve, FICB)	1.25	− 0.32–2.81	0.11
Ropivacaine concentration (0.375%, 0.75%)	− 0.13	− 1.56–1.30	0.43
One-way ANOVA
Fracture type (femoral neck, trochanteric, femoral shaft)			0.10
Correlation	Pearson’s r
Age	− 0.063		0.32
Volume of ropivacaine 0.375%	− 0.230		0.14
Volume of ropivacaine 0.75%	− 0.078		0.33

Mean difference is without dimension because it is the absolute reduction in pain score on a 0–10 numeric rating scale. A positive difference indicates the pain score reduction is larger in a variable’s second value

FICB fascia iliaca compartment block