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Table 4 Classification of patients according to level of tramadol in urine assay and its relation to serum level of IL-2 in them

From: Association between opioid use disorder (tramadol) and serum level of interleukin-2

  Patients with urine assay of tramadol 50–200 ng/ml (n = 17) Patients with urine assay of tramadol > 200 ng/ml (n = 42) t test P value
Mean ± SD Mean ± SD
Serum level of IL2 312.93 ± 27.69 357.79 ± 35.25 4.686 0.000