Table 2.

Primary and secondary outcomes

Outcome	ICB group	C group	P	Difference between means with 95% confidence intervals
Pain at 2 to 4 hours post-operatively* [n=29(ICB), 28(C)]
At rest	3.0 (2.0)	3.0 (2.2)	0.95	0.04 (-1.1 to+1.1)
On coughing	4.6 (2.2)	4.9 (2.7)	0.62	0.32 (-1.0 to+1.6)
Pain at 18 to 24 hours post-operatively* [n=29(ICB), 30(C)]
At rest	2.1 (1.6)	2.4 (1.6)	0.53	0.26 (-0.6 to+1.1)
On coughing	4.0 (1.7)	4.4 (2.2)	0.35	0.49 (-0.6 to+1.5)
Maximum volume achieved on spirometry (absolute value in ml) [n=29(ICB), 28(C)]	1148 (350)	1062 (352)	0.37	94 (-275 to+104)
Maximum volume achieved on spirometry (percentage of baseline)	0.6 (0.2)	0.6 (0.2)	0.50	-0.04 (-0.14 to+0.05)
Postoperative fentanyl requirements (mcg/kg)	4.4 (3.1)	5.0 (2.1)	0.39	0.6 (-1.1 to+2.3)

Data is expressed as mean (with standard deviation in brackets) *Pain scores are reported on a Numerical Rating Scale of 1 to 10