Table 1

Demographic features



Group I
Group II
Group III

Number of patients

201
446
509
Number of procedures

330
662
827
Age [yrs] [mean ± SEM ]

52 ± 1.1
50 ± 0.7
50 ± 0.6
Gender





Male
40% [81]
33% [146]
34% [175]

Female
60% [119]
67% [300]
66% [334]
Body mass index [mean ± SEM]

29.4 ± 0.56
29.1 ± 0.37
28.6 ± 0.31

Manchikanti et al. BMC Anesthesiology 2003 3:2   doi:10.1186/1471-2253-3-2