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. Author manuscript; available in PMC: 2019 Oct 15.
Published in final edited form as: Biol Psychiatry. 2019 Mar 1;86(8):599–607. doi: 10.1016/j.biopsych.2019.02.016

Table 1.

Cohort characteristics

NTR (N=2258*) Dunedin Study (N=800)     E-risk study (N=1631)
Characteristic Mean (SD) or
N (%)		 Characteristic Mean (SD) or
N (%)		 Characteristic Mean (SD) or
N (%)
CAARS ADHD index 7.9 (3.9) DSM-5 Adult ADHD Symptoms 1.5 (2.3) DSM-5 Adult ADHD Symptoms 5.8 (4.3)
Age at blood sampling (years) 37.3 (12.9) Age at blood sampling (years) 38 (0) Age at blood sampling (years) 18 (0)
Sex: female 1549 (69.0%) Sex: female 392 (49.0%) Sex: female 817 (50.1%)
Current smoker 438 (19.4%) Current smoker 162 (20.3%) Current smoker** 372 (22.8%)
Former smoker 532 (23.6%) Former smoker 233 (29.1%)
Never smoked 1288 (57.0%) Never smoked 405 (50.6%) Non-smoker ** 1259 (77.2%)
*

In NTR, 2258 samples from 2232 individuals were included (for 26 individuals, two longitudinal DNA samples were included).

**

In E-risk, the smoking variable that was included as covariate in the analyses and that is presented in this table is current daily smoking at age 18.