Table 1 Characteristics of the ADHD centers and patients.

Centers (N = 16)

 Clinical staff professionals (median)

5

2–11

 Hours/year/patient of work (median)

10.0

4.0–70.4

 Median time from the request to diagnosis (days)

162

50–370

 < 0.0001*

Patients N (%)

 Total

1.429

24–252

 Median age at diagnosis (years)

8

8—11

 < 0.0001*

 Male

1.232 (86.2)

19–210 (77.4–97.9)

0.0002*

 Only child

368 (25.8)

4–70 (11.4–34.9)

0.0813

 Born abroad

73 (5.1)

0–18 (0–11.5)

0.0072*

 Adopted

58 (4.1)

0–13 (0–9.5)

0.0642

 School failures

44 (3.1)

0–11 (0–8.6)

0.1564

 Employed parents

911 (63.8)

14–154 (40.0–83.3)

 < 0.0001*

 Family history of ADHD

269 (18.8)

3–54 (7.3–34.0)

 < 0.0001*

 Dystocic delivery

338 (23.7)

4–47 (11.4–38.5)

0.0640

 Preterm/low weight

149 (10.4)

1–20 (2.9–20,4)

0.0907

 Exclusive breastfeeding ≥ 3 months

732 (51.2)

15–116 (9.6–76.9)

 < 0.0001*

 Motor delay

73 (5.1)

1–9 (1.3–17.1)

0.0196*

 Language delay

315 (22.0)

2–56 (7.5–31.9)

0.0049*

 ADHD type

 Combined

911 (63.8)

10–180 (28.6–83.9)

 < 0.0001*

 Inattentive

393 (27.5)

7–68 (14.3–48.2)

 < 0.0001*

 Hyperactive/impulsive

125 (8.7)

1–26 (1.5–31.4)

 < 0.0001*

CGI-S score 5–7 at diagnosis

448 (31.4)

5–81 (5.7–70.8)

 < 0.0001*

Comorbidities

 Psychiatric comorbidities

996 (69.7)

17–173 (48.9–95.0)

 < 0.0001*

 Chronic diseases

80 (5.6)

0–14 (0–29.2)

 < 0.0001*

Therapy N (%)

 Psychological alone

751 (52.6)

3–135 (12.5–84.9)

 < 0.0001*

 Combined

229 (16.0)

1–50 (2.1–42.9)

 < 0.0001*

 Methylphenidate alone

180 (12.6)

0–43-(0–50.0)

 < 0.0001*

 None

269 (18.8)

2–75 (3.2–51.2)

 < 0.0001*