Table 2.

The averaged smiles in the first and second session of children with autism spectrum disorder (ASD) (unit is seconds).

ASD session 1	ASD session 2	Timing
Smile duration	Smile duration
Mean ± SD	Mean ± SD
23.7 ± 17.9	24.9 ± 20.1	1 min after entering the intervention room
20.2 ± 12.9	24.6 ± 11.1	1 min before walking with the robot
35.5 ± 16.8	19.6 ± 15.2	1 min after starting walking with the robot
28.1 ± 11.9	24 ± 10.1	1 min before falling of the robot
7.7 ± 4.3	9.7 ± 4.3	While the robot was falling
43 ± 10.1	17.8 ± 8.7	1 min after the fallen robot was adjusted