obs	gender	dosage	alertness 
1                      m                        10                         8 
2                      m                        10                         12 
3                      m                        10                         13 
4                      m                        10                         12 
5                      m                        25			6 
6                      m                        25                      7 
7                      m                        25                        23 
8                      m                        25                        14 
9                      f                        10                         15 
10                     f                        10                         12 
11                     f                        10                         22 
12                     f                        10                         14 
13                     f                        25                        15 
14                     f                        25                        12 
15                     f                        25                        18 
16                     f                        25                        22