Table 3.

Therapeutic procedural characteristics with procedural frequency, average relief per procedure, and average total relief in weeks over a period of 2 years.

	Group I (50)	Group II (50)	Combined (100)
One year
Average number of procedures per one year (range)	3.5 ± 1.0(1–5)	3.5 ± 0.9(1–4)	3.5 ± 0.9(1–5)
Average total relief per year (weeks) (range)	47.2 ± 10.1(4–52)	46.3 ± 8.4(16–52)	47.0 ± 9.0(4–52)
Average relief per procedure (range)	15.8 ± 10.5(2–52)	13.6 ± 3.6(10–26)	15.1 ± 8.6(2–52)
Two years
Average number of procedures per two years (range)	5.6 ± 2.4(1–8)	6.2 ± 2.2(1–8)	5.9 ± 2.3(1–8)
Average total relief per two years (weeks) (range)	84.7 ± 26.1(4–104)	88.7 ± 22.1(26–104)	86.7 ± 24.1(4–104)
Average relief per procedure (range)	20.4 ± 20.8(2–104)	17.4 ± 14.4(8–104)	18.9 ± 17.8(2–104)