Erratum to: Eur Arch Psychiatry Clin Neurosci (2014) 264:401–408 DOI 10.1007/s00406-014-0486-8

Unfortunately, we recently identified a batch effect in PCR readings in which reverse coding for CC and TT genotypes of DAT1 rs2652511 polymorphism was detected. The identification of the CT genotype remained correct. Since the frequency of heterozygotes did not change, the genotype frequencies were in Hardy–Weinberg equilibrium (P > 0.05) in both the original and corrected versions of the article. Importantly, we emphasize that this coding error did not affect the genotyping data of DAT1 VNTR polymorphisms, including the association between the 6-repeat allele of the Int8 VNTR polymorphism and higher inattention scores in patients with ADHD.

We reran our statistical analyses with the corrected genotypes of DAT1 rs2652511 polymorphism. (1) Logistic regression for case–control analysis: in contrast to the original paper, the authors found no evidence to support the association between the rs2652511 C-allele and ADHD (Table 2 in the original paper). The correct sentence in the corresponding text in Results section of the original paper would be “We found no significant association between the rs2652511 and ADHD”. An updated version of Table 2 is given. (2) Analysis of covariance (ANCOVA) for SNAP-IV scores: once more, our findings regarding the rs2652511 polymorphism remained non-significant (Table 3 in the original paper). Thus, interpretations and conclusions related to the ADHD dimensions remain unaltered. The corrected P values are as follows: hyperactivity, P = 0.643; inattention, P = 0.482; total sum of ADHD symptoms, P = 0.915; and ODD, P = 0.959.

Table 2 Genotype analyses of the DAT1 polymorphisms 3′-UTR VNTR, Int8 VNTR, and −839 C>T (rs2652511) and haplotype analysis for VNTR polymorphisms on susceptibility to ADHD
Full size table

Although this error unfortunately resulted in incorrect assignment of statistical significance to the rs2652511 polymorphism in adult ADHD, our results still support one of the major interpretations and conclusions of this research, particularly regarding the association between the 6-repeat allele of the Int8 VNTR polymorphism and higher scores of inattention in adult patients with ADHD. The authors apologize for any inconvenience that our errors may have caused.