| Author/Year | Design | N | Population | Country | Outcome (ADHD) |
| 1) Grizenko, N. (2016) [49] | Cohort study | 452 | 2 groups of children with and without ADHD | Canada | Low 1-minute Apgar scores are associated with a significant increase in ADHD symptom severity |
| 2) Gustafsson, P. (2011) [52] | Retrospective study | 237 | Children with ADHD | Sweden | ADHD was significantly associated with preterm birth < 32 weeks and Apgar scores at 5 minutes below 7 were significantly associated with ADHD |
| 3) Sucksdorff, M. (2018) [53] | Population-based study | 10,409 | Children who had diagnosed with ADHD and a control group | Finland | Cesarean sections and perinatal adversities leading to lower Apgar scores increased the risk of ADHD |
| 4) Ben Amor (2005) [55] | Retrospective study | 70 | Children with ADHD | France | The children with ADHD had significantly higher rates of neonatal complications compared with their unaffected siblings |
| 5) Hatch, B. (2014) [61] | Longitudinal study | 197 | Children. The sample was a part from a larger longitudinal study | USA | lower birth weight was associated with ADHD symptoms |
| 6) van Mil (2015) [62] | Cohort study | 6015 | Children. Sample from a population based birth cohort | Holland | Higher birth weight was related to less attention problems |
| 7) Perapoch, J. (2019) [66] | Cohort study | 3744 | Children who born premature | Spain | Prevalence of ADHD increases as gestational age decreases, 12.7% for those born ≤28 gw, compared to 3.2% for those born after the 37 gw |