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. 2015 Oct 14;15:146. doi: 10.1186/s12871-015-0126-5

Table 2.

Block characteristics in the studied groups

Block characteristics	Fentanyl group	Meperidine group	Clonidine group	Analysis of variance or X²
	Fentanyl group	Meperidine group	Clonidine group	F or X²	P
	(n = 45)	(n = 45)	(n = 45)	F or X²	P
Highest level of sensory blockade. T9	17 (37.7 %)	20 (44.4 %)	19 (42.2 %)	1.36	0.968
T8	12 (26.6 %)	14 (31.1 %)	13 (28.8 %)
T7	10 (22.2 %)	7 (15.5 %)	8 (17.7 %)
T6	6 (13.3 %)	4 (8.8 %)	5 (11.1 %)
Time to reach sensory block. (min)	5.4 ± 1.4	5.8 ± 1.2	5.5 ± 1.1	0.829	0.652
Time to S max. (min)	7.5 ± 1.5	8.1 ± 1.7	7.8 ± 1.4	0.755	0.495
Time to ready for surgery. (min)	6.4 ± 1.3	7.5 ± 1.6	6.9 ± 1.5	0.582	0.675
Duration of motor block. (min)	148 ± 36	133.5 ± 40	140 ± 35	4.95	0.074
Grade of motor blockade	10	9	11	0.257	0.879
BS 2	35	36	34
BS 3			34
Time to 1^st analgesic requirement. (min)	197 ± 56	318 ± 72	155 ± 42	150.48	0.001

Data are mean ± standard deviation or number (%)

BS: Bromage scale