Table 1.

Log LF/HF before and after administration of opioids (n = 7)

Period of log LF/HF recording	Min	Max	MV	SD
T − 2: 30 minutes until the start of opioid treatment	−0.38	0.58	0.19	0.32
T − 1: 15 minutes until the start of opioid treatment	−0.68	0.57	0.14	0.38
T + 1: 10–30 minutes after the start of opioid therapy	−0.43	0.59	0.17	0.33
T + 2: 10–45 minutes after the start of opioid therapy	−0.39	0.55	0.10	0.35
T + 3: 10–75 minutes after the start of opioid therapy	−0.62	0.60	0.07	0.37
T + 4: 10–135 minutes after the start of opioid therapy	−0.24	0.65	0.12	0.29

Abbreviations: LF, low frequency; HF, high frequency; Min, minimum; Max, maximum; MV, mean value; SD, standard deviation.