Determine the concentration at the beginning of the interval
pk.calc.cstart(conc, time, start)
The concentration when time == end
. If none match, then NA
Measured concentrations
Time of the measurement of the concentrations
The start time of the interval
Other NCA parameters for concentrations during the intervals:
pk.calc.clast.obs()
,
pk.calc.cmax()
,
pk.calc.count_conc()
,
pk.calc.ctrough()