density subject intruder yes count
1 low  male    male   18 19
2 low  male    female 15 23
3 low  female  male   17 22
4 low  female  female 12 19
5 high male    male   13 19
6 high male    female 16 20
7 high female  male   10 19
8 high female  female 14 20