Table 1 Descriptive statistics of individuals with attention-deficit/hyperactivity disorder (ADHD) with or without coexisting autism spectrum disorder (ASD)
ADHD without coexisting ASD | ADHD with coexisting ASD | ||
|---|---|---|---|
Number of individuals (%) | Number of individuals (%) | p value* | |
Total number of individuals | 34,374 | 5012 | |
Sex | |||
Males | 21,918 (63.8) | 3395 (67.7) | |
Females | 12,456 (36.2) | 1617 (32.3) | < 0.0001 |
Year of birth | |||
> 2000 | 2187 (6.4) | 477 (9.5) | |
1991-2000 | 14,571 (42.4) | 2257 (45.0) | |
1981-1990 | 7243 (21.1) | 1202 (24.0) | |
1971-1980 | 4662 (13.6) | 569 (11.4) | |
1961-1970 | 3846 (11.2) | 353 (7.0) | |
< 1961 | 1865 (5.4) | 154 (3.1) | < 0.0001 |
Age (years) at first ADHD diagnosis, median, range | 18 (3-80) | 16 (3-80) | < 0.0001 |
Age (years) at first ASD diagnosis, median, range | 16 (3-80) | ||
Age (years) at first ADHD diagnosis | |||
3-12 | 9143 (26.6) | 1699 (33.9) | |
13-17 | 7784 (22.7) | 1070 (21.4) | |
18-29 | 8120 (23.6) | 1325 (26.4) | |
30-39 | 4515 (13.1) | 502 (10.0) | |
40-49 | 3460 (10.1) | 326 (6.5) | |
50-59 | 1171 (3.4) | 78 (1.6) | |
> 60 | 181 (0.53) | 12 (0.24) | < 0.0001 |
Age (years) at first ASD diagnosis, | |||
3-12 | 1708 (34.1) | ||
13-17 | 1130 (22.6) | ||
18-29 | 1269 (25.3) | ||
30-39 | 485 (9.7) | ||
40-49 | 323 (6.4) | ||
50-59 | 86 (1.7) | ||
> 60 | 11 (0.22) | ||
ASD diagnosed before ADHD | 1267 (25.3) | ||
ASD and ADHD diagnosed on the same date | 2167 (43.2) | ||
ASD diagnosed after ADHD | 1578 (31.5) | ||
Comorbid diagnoses diagnosed before ADHD | |||
Depression | 6580 (19.1) | 944 (18.8) | 0.60 |
Anxiety disorders (excluding OCD) | 6397 (18.6) | 894 (17.8) | 0.19 |
SUD Alcohol | 4062 (11.8) | 367 (7.3) | < 0.0001 |
SUD Narcotics | 3879 (11.3) | 323 (6.4) | < 0.0001 |
Suicidal attempt | 3500 (10.2) | 445 (8.9) | 0.0041 |
Stress related disorders and PTSD | 3249 (9.5) | 397 (7.9) | 0.0005 |
Bipolar disorder | 1782 (5.2) | 199 (4.0) | 0.0002 |
Intellectual disability | 1224 (3.6) | 399 (8.0) | < 0.0001 |
Psychotic disorder | 868 (2.5) | 180 (3.6) | < 0.0001 |
OCD | 773 (2.3) | 260 (5.2) | < 0.0001 |
Eating disorder | 701 (2.0) | 113 (2.3) | 0.32 |
Schizophrenia | 237 (0.7) | 55 (1.1) | 0.0017 |