Table 2. List of items included in the jmSRS and criteria for scoring based on the 1–5 likert rating scales.

For the following statements, select the score that best represents the subject based on your current observations. Leave any comments if you feel you cannot accurately rate the statement or have other concerns.

1 = not true (0%), 2 = sometimes true (25%), 3 = often true (50%), 4 = almost always true (75%), 5 = always true (100%)

1. Seems self-confident when interacting with others. R

2. Would rather be alone than with others.

3. Behaves in ways that seem strange or bizarre for others of comparable age/rank/gender categories.

4. Is not well coordinated in physical activities.

5. Responds appropriately to other monkeys’ vocalizations and facial expressions. R

6. Avoids eye contact or has unusual eye contact.

7. Plays appropriately with peers. R

8. Avoids social interactions with others.

9. Is socially awkward.

10. Has a restricted or unusually narrow range of interests.

11. Has repetitive, odd behaviors such as hand flapping, rocking/swaying, tumbling or spinning.

12. Is too tense in social situations, e.g., walks siffly, stiffens or freezes when others approach.

13. Stares or gazes off into space.

14. Manifests species and status-typical reaction to loss of a valued resource. R

The jmSRS was adapted from the adult mSRS [33]. R: reverse-coded items (after data collection, the scoring of these items was reversed, so that higher scores meant greater social impairment for each item).