Table 1. Compositions of the six study one-male units.
| one-male unit | JB | FP | RX | PK | BB | JZT |
| Group size* | 14 16 | 13 17 | 11 14 | 11 13 | 13 17 | 9 11 |
| Adult males | 1 | 1 | 1 | 1 | 1 | 1 |
| Mother/Adult females* | 1/5 3/6 | 3/5 2/5 | 2/4 2/4 | 1/4 2/4 | 1/6 3/6 | 2/3 1/3 |
| percentage of time grooming | 14 | 11 | 13 | 9 | 16 | 17 |
| percentage of reciprocated bouts | 25 | 26 | 28 | 28 | 26 | 30 |
| median rank distance between grooming partners | 3 | 3 | 2 | 2 | 3 | 2 |
*
There were two observation periods: the first row represents the first period (2009.3–2010.1), the second row represents the second period (2010.3–2010.7). Female R. roxellana typically give birth to a single infant. Thus, in our observation period the number of mothers equals the number of infants in each one-male unit.