Table 2.

Features with the highest impact on the classifier based on SHAP analysis.

Feature	Relative impact (%)	Alarming range
A. Semi-automatic feature selection strategy
Rotation	52	Earlier than 148 days
FL in T3	19	Higher than 72%
Newborn feeding	9	Mixed (breastfeeding and artificial)
Sex	7	Male
Auto-immune	4	Yes
B. Fully automatic feature selection strategy
Rotation	44	Earlier than 148 days
White cells in T3	16	Less than 9100
FL in T3	13	Higher than 72%
Sex	9	Male
Newborn feeding	5	Mixed (breastfeeding and artificial)

For each feature, the relative impact and the alarming range, i.e. the range of values that push the classifier to ASD decision, are presented. T3, third trimester. Rotation, timing of fetal rotation on head; FL, femur length percentile; Auto-immune, familial maternal history of auto-immune diseases.