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. 2017 Nov 15;75(1):47–55. doi: 10.1001/jamapsychiatry.2017.3523

Table 1. Distribution of Study Variables Among Study Cohort Members Born in Sweden Between 1976 and 1998, Stratified by Obsessive-Compulsive Disorder.

Characteristic, No. (%) Individuals With Obsessive-Compulsive Disorder
(n = 15 120)
Unaffected Individuals
(n = 2 100 434 )
Female 8996 (59.5) 1 021 113 (48.6)
Age of mothers at birth of study participant, mean (SD), ya 28.4 (5.3) 28.0 (5.0)
Age of fathers at birth of study participant, mean (SD), ya 31.2 (6.2) 30.7 (5.8)
Missing 101 (0.7) 13 950 (0.7)
Paritya
1 6444 (42.6) 853 017 (40.6)
2 5227 (34.6) 766 216 (36.5)
3 2253 (14.9) 326 417 (15.5)
≥4 1000 (6.6) 125 379 (6.0)
Missing 196 (1.3) 29 403 (1.4)
Comorbidity
Attention-deficit/hyperactivity disordera 2644 (17.5) 53 215 (2.5)
Other neuropsychiatric disordersa,b 2718 (18.0) 27 020 (1.3)
Schizophrenia, schizotypal, or delusional disordersa 982 (6.5) 9133 (0.4)
Phobic, anxiety, stress reaction, and adjustment disordersa 8643 (57.2) 129 872 (6.2)
Affective disordersa 7132 (47.2) 109 494 (5.2)
Substance use disordersa 2343 (15.5) 88 730 (4.2)
Other disordersa,c 2517 (16.7) 33 358 (1.6)
a

Statistically significant between-group difference determined with a χ2 test or 2-tailed t test; all marked comparisons yielded P < .001.

b

Includes pervasive developmental disorders, Tourette syndrome and chronic tic disorders, and learning disabilities.

c

Includes dissociative, somatoform, other neurotic, and eating disorders.