Table 2 Reasons for exclusion (A), and statistical comparison of clinical and other characteristics of included and excluded participants (B)

Withdrew from the study after 1^st session

Covid-19 related issues

EEG attempted

but unsuccessful

Noisy EEG data

N = 61

8 (13.1%)

13 (21.3%)

31 (50.8%)

7 (11.5%)

Age

Sex

IQ (Full scale)

IQ (Verbal)

IQ (Non-verbal)

ADOS severity

Included in analysis (N = 33)

7.54 ± 1 [6.1–9.4]

29(M)

4 (F)

92.9 ± 16 [58–131]

90.4 ± 20 [56–130]

95.5 ± 16 [64–128]

7.78 ± 1.5 [5–10]

Excluded from

analysis (N = 61)

7.46 ± 1 [6–9.5]

50 (M)

11 (F)

83.8 ± 19 [50–124]

75.9 ± 22 [45–128]

92.5 ± 19 [56–143]

8.1 ± 1.7 [3–10]

Difference (two

sample T test)

t-stat = 0.1

df = 92

p = 0.87

χ²stat = 0.56

p = 0.45

t-stat = 2.6

df = 92

p = 0.01

t-stat = 3

df = 92

p = 0.003

t-stat = 0.8

df = 92

p = 0.42

t-stat = 0.4

df = 92

p = 0.63