Effectiveness of wound infusion of 0.2% ropivacaine by patient control analgesia pump after minithoracotomy aortic valve replacement: a randomized, double-blind, placebo-controlled trial

Table 2 Demographic data for both groups

Demographic data	Ropivacaine group	0,9% saline group	P value
No. of patients studied	35	35
Age, median (25th–75th percentilles) in years	76 (69–78)	76 (72–81)	0.083¹
Female	15	16	0.810²
Male	20	19
No. of patients smoking	7	6	0.758²
1 – Mann-Whitney U test 2 – χ²test

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