based on {HEAD ~ the measurements} obtained in {TAIL ~ step b}, plotting the alcohol concentration levels for an individual versus time and using computerized techniques to obtain value of the Area Under the Curve for the ascending and descending parts of the plotted data 
obtained in
based on { HEAD ~ the measurements } obtained in { TAIL ~ step b } , plotting the alcohol concentration levels for an individual versus time and using computerized techniques to obtain value of the Area Under the Curve for the ascending and descending parts of the plotted data
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH