Tobramycin data set

This data set has been originally published in:

Aarons, L., Vozeh, S., Wenk, M., Weiss, P. H., & Follath, F. (1989). Population pharmacokinetics of tobramycin. British journal of clinical pharmacology, 28(3), 305-314.

Tobramycin is an antimicrobial agent of the aminoglycosides family, which is among others used against severe gram-negative infections. Because tobramycin does not pass the gastro-intestinal tract, it is usually administrated intravenously as intermittent bolus doses or short infusions. Tobramycin is a drug with a narrow therapeutic index.

Tobramycin bolus doses ranging from 20 to 140mg were administrated every 8 hours in 97 patients (45 females, 52 male) during 1 to 21 days (for most patients, during ~6 days).  Age, weight (kg), sex and creatinine clearance (mL/min) were available as covariates. The tobramycin concentration (mg/L) was measured 1 to 9 times per patients (322 measures in total), most of the time between 2 and 6h post-dose.

Below is an extract of the data set:

cs-tobramycin-dataset-1-extract

The columns have the following meaning:

  • ID: the subject’s ID.
  • TIME: the time of the record (administration or measurement) in hours.
  • CP: the measured drug’s concentration in mg/L.
  • EVID: event identifier, 1 for doses and 0 for response lines (measurements).
  • DOSE: the amount of drug administrated¬†to this subject in mg.
  • WT: weight of the subject in kg.
  • SEX: sex of the subject.
  • CLCR: creatinine clearance of the subject in mL/min.

Several points can be noticed:

  1. The four first lines correspond to doses, while the other ones are measurements, as indicated by the EVID column. The MDV column is not necessary. The zeros of the DOSE and CP columns could have been replaced by dots ‘.’ .
  2. The covariates columns (WT, SEX and CLCR) are filled with the same value for each individual. Covariates must be constant within subjects (or subject-occasions when occasions are defined).

The data set and datxplore project file can be downloaded here.