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Table 1 Nonparametric correlation analyses between pairs of variables in chickens (n = 10) undergoing inhalation anaesthesia with isoflurane and sevoflurane alone or combined with NaCl solution (0.25 ml/kg), butorphanol (1 mg/kg) or medetomidine (0.1 mg/kg) in a cross-over randomized study; significant correlations between pairs of variables set in bold. Data obtained as a result of repeated measurements in each individual. Correlations between MAC, HR, NIBP, BISpre, BISpost, BISdiff, SR, and VAS combining data of each anaesthetic protocol are represented

From: Effects of isoflurane and sevoflurane alone and in combination with butorphanol or medetomidine on the bispectral index in chickens

  HR NIBP VAS BISpre BISpost BISdiff SR
MAC ρ = 0.26
P < 0.001
n = 268
ρ = −0.51
P < 0.001
n = 237
ρ = −0.54
P < 0.001
n = 268
ρ = − 0.54
P < 0.001
n = 266
ρ = − 0.41
P < 0.001
n = 267
ρ = 0.25
P < 0.001
n = 266
ρ = 0.60
P < 0.001
n = 267
HR   ρ = −0.20
P = 0.002
n = 237
ρ = −0.12
P = 0.047
n = 267
ρ = 0.09
P = 0.134
n = 266
ρ = 0.10
P = 0.092
n = 267
ρ = 0.06
P = 0.330
n = 266
ρ = 0.04
P = 0.526
n = 267
NIBP    ρ = 0.41
P < 0.001
n = 237
ρ = 0.33
P < 0.001
n = 236
ρ = 0.26
P < 0.001
n = 236
ρ = −0.16
P = 0.015
n = 236
ρ = −0.39
P < 0.001
n = 236
VAS     ρ = 0.45
P < 0.001
n = 266
ρ = 0.41
P < 0.001
n = 266
ρ = −0.08
P = 0.218
n = 266
ρ = −0.50
P < 0.001
n = 266
BISpre      ρ = 0.80
P < 0.001
n = 266
ρ = −0.25
P < 0.001
n = 266
ρ = −0.86
P < 0.001
n = 266
BISpost       ρ = 0.27
P < 0.001
n = 266
ρ = −0.83
P < 0.001
n = 267
BISdiff        ρ = 0.06
P = 0.321
n = 266
  1. Abbreviations: MAC minimum anaesthetic concentration multiple, HR heart rate, NIBP non-invasive blood pressure, BISpre bispectral index before stimulus, BISpost bispectral index after stimulus, BISdiff difference between BISpre and BISpost, SR suppression ratio, VAS visual analog scale