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. Author manuscript; available in PMC: 2020 Jan 2.
Published in final edited form as: Environ Int. 2019 Jul 29;131:105002. doi: 10.1016/j.envint.2019.105002

Table 3.

Descriptive statistics of ADHD and autistic traits scores.

Mean ± SD Min Max Clinical cases (N (%))a,b N
ADHD score at age 3 years 3.1 ± 2.3 0.0 11.0 42 (6.8%) 618
ADHD score at age 6 years 3.2 ± 2.6 0.0 12.0 41 (5.3%) 777
ADHD score at age 10 years 2.6 ± 2.7 0.0 12.0 39 (6.6%) 588
Autistic traits at age 6 years 4.1 ± 4.2 0.0 32 12 (1.9%) 622
a

Any ADHD score that falls below the 93rd percentile is considered normal, scores above the 93 percentile are borderline clinical, or clinical cases (Achenbach and Rescorla, 2000, 2001).

b

We utilized the cut-off values recommended by the authors of the SRS for screening in population-based studies (consistent with weighted scores of 1.078 for boys and 1.000 for girls) (Constantino et al., 2003).