Table 3 Comparison of PWS and AS participants on ADOS-2 algorithm items using Fisher’s exact test

 Pointing

19

68.5

.075

.343

 Gestures

19

52.6

.999

.046

 Eye contact

19

52.6

.542

.115

 Facial expressions

19

84.2

.181

.225

 Shared enjoyment

19

31.6

.032

.361

 Showing

19

42.1

.717

.088

 Response to joint attention

19

26.3

.363

.222

 Initiation of joint attention

19

42.1

.240

.265

 Quality of social overtures

19

78.9

.335

.162

 Amount of social overtures

19

57.9

.223

.218

 Rapport

19

73.7

.467

.127

 Reporting^a

–

–

–

–

 Conversation^b

–

–

–

–

 Amount of communication^b

–

–

–

–

 Insight^a

–

–

–

–

 Communication of own affect^c

–

–

–

–

 Sensory

19

5.3

.013

.397

 Mannerisms

19

89.5

.001

.539

 Repetitive and stereotyped behaviours

19

68.4

.999

.046

 Stereotyped language^b

–

–

–

–