Table 1.

Autistic traits in SSRDs—summary table.

Reference	Sample	Methods	Results
Hatta et al. (2019) [27]	HC: N = 26 (F = 12; M = 14; mean age: 12.7 ± 1.9); SSD: N = 28 (F = 15; M = 13; mean age: 13.4 ± 2.0)	AQ—children’s version	42.9% of individuals with SSD had an AQ score above the average Higher scores in the AQ “Attention Switching” domain were associated with reduced health-related quality of life
Nisticò et al. (2022) [31]	NA: N = 45 (F = 17; M = 28; mean age: 35.36 ± 11.85); ASD: N = 30 (F = 14; M = 16; mean age: 39.67 ± 12.18) FNDs: N = 21 (F = 17; M = 4; mean age: 42.9 ± 13.02)	RAADS-R; AQ; FNS; SPQ-SF35.	86.7% of individuals with ASD reported at least one FNS vs. 35.6% of NAs Individuals with FNDs did not exhibit more autistic traits than NAs
Cole et al. (2023) [36]	FND: N = 91 (F = 69; M = 22; mean age: 43.42 ± 13.39)	AQ-10; PHQ-15; PHQ9; ASRS; TASS-20; GAD-7; WSAS.	36 subjects scored above the AQ-10 threshold 36 subjects screened positive for alexithymia AQ-10 had a direct effect on somatic symptoms Significant association between autistic traits and PHQ9 depression scores mediated by alexithymia score
Miyawaki et al. (2016) [37]	10-year-old girl with undiagnosed ASD and PNES	Pervasive Developmental Disorders Autism Society Japan Rating Scale; Children’s Global Assessment Scale	PNES as an outcome of psychological distress
McWilliams et al. (2019) [38]	ASD: N = 10 (F = 6; M = 4) HC: N = 49 (F = 31; M = 18)	Video EEG	10 subjects with non-epileptic seizures had clinically diagnosed ASD, and 5 had undiagnosed ASD