Documentation TwinLife Data: Height, Weight, and BMI

Lenau F, Hahn E. Documentation TwinLife Data: Height, Weight, and BMI. TwinLife Technical Report Series. Vol 06. Bielefeld: Project TwinLife "Genetic and social causes of life chances" (Universität Bielefeld / Universität des Saarlandes); 2017

Documentation TwinLife Data: Zygosity

Lenau F, Hahn E. Documentation TwinLife Data: Zygosity. TwinLife Technical Report Series. Vol 01. Bielefeld: Project TwinLife "Genetic and social causes of life chances" (Universität Bielefeld / Universität des Saarlandes); 2017

Zygosity Determination in Twin Studies: a Validation of Zygosity Questionnaires Using DNA in the German TwinLife Study

Lenau F, Hahn E, Peters A-L, Gottschling J, Thiel W, Spinath FM. Zygosity Determination in Twin Studies: a Validation of Zygosity Questionnaires Using DNA in the German TwinLife Study. TwinLife Working Paper Series. Vol 01. Bielefeld: Project TwinLife "Genetic and social causes of life chances" (Universität Bielefeld / Universität des Saarlandes); 2017.Zygosity determination using similarity ratings is frequently applied in twin studies. A correct determination of zygosity is essential for the estimation of heritability and environmental influences on phenotypes. Therefore, the present study examined the validity of two similarity questionnaires used in the German TwinLife study, in which data from 4,097 twin pairs and their families were assessed: twin children’s zygosities were determined with the Zygosity Questionnaire for Young Twins, which was administered in parent-report form. For adolescent twins, the Self Report Zygosity Questionnaire was used. For the present validation analyses, DNA samples of N = 328 twin pairs were collected via buccal swabs. In this DNA subsample, questionnaires were filled out by parents for n = 212 (aged 4 to 12 years) twin pairs while self-reports were collected from n = 116 adolescent twins (16 to 23 years of age). Using DNA-based zygosity as criteria, correct classification rates of 97% for parent- and 92% for self-reports were established and cross-validated. Additionally, classification rates based on a single item and variants of questionnaire based zygosity determination used in other twin studies were calculated and compared. Implications of incorrectly classified zygosity on genetic and environmental estimates in twin studies are discussed

A longitudinal twin family study of the life course and individual development (TWINLIFE): Data collection and instruments of wave 1 face-to-face interviews

Brix J, Pupeter M, Rysina A, et al. A longitudinal twin family study of the life course and individual development (TWINLIFE): Data collection and instruments of wave 1 face-to-face interviews. TwinLife Technical Report Series. Vol 05. Bielefeld: Project TwinLife "Genetic and social causes of life chances" (Universität Bielefeld / Universität des Saarlandes); 2017

Der traurige Mönch. Ballade von N. Lenau. Mit melodramatischer Pianoforte-Begleitung zur Declamation

DER TRAURIGE MÖNCH. BALLADE VON N. LENAU. MIT MELODRAMATISCHER PIANOFORTE-BEGLEITUNG ZUR DECLAMATION Der traurige Mönch. Ballade von N. Lenau. Mit melodramatischer Pianoforte-Begleitung zur Declamation ( - ) Einband ( - ) Titelseite (1) Der traurige Mönch. (Text) (3) Der traurige Mönch. (Noten) (5

Der traurige Mönch. Ballade von N. Lenau. Mit melodramatischer Pianoforte-Begleitung zur Declamation

DER TRAURIGE MÖNCH. BALLADE VON N. LENAU. MIT MELODRAMATISCHER PIANOFORTE-BEGLEITUNG ZUR DECLAMATION Der traurige Mönch. Ballade von N. Lenau. Mit melodramatischer Pianoforte-Begleitung zur Declamation ([1]) Titelseite ([1]) Text ([3]) Noten: Der traurige Mönch (5

Documentation TwinLife Data: Height, Weight, and BMI. F2F2

Klatzka CH, Paulus L, Lenau F, Hahn E. Documentation TwinLife Data: Height, Weight, and BMI. F2F2. TwinLife Technical Report Series. Vol 06 v.2.0.0. Bielefeld: Project TwinLife "Genetic and social causes of life chances" (Universität Bielefeld / Universität des Saarlandes); 2021

Documentation TwinLife Data: Height, Weight, and BMI

Klatzka CH, Paulus L, Lenau F, Hahn E. Documentation TwinLife Data: Height, Weight, and BMI. TwinLife Technical Report Series. Vol 06 v.3.0.0. Bielefeld: Project TwinLife "Genetic and social causes of life chances" (Universität Bielefeld / Universität Bremen / Universität des Saarlandes); 2024

What Drives the Development of Social Inequality Over the Life Course? The German TwinLife Study

The German twin family study 'TwinLife' was designed to enhance our understanding of the development of social inequalities over the life course. The interdisciplinary project investigates mechanisms of social inequalities across the lifespan by taking into account psychological as well as social mechanisms, and their genetic origin as well as the interaction and covariation between these factors. Main characteristics of the study are: (1) a multidimensional perspective on social inequalities, (2) the assessment of developmental trajectories in childhood, adolescence, and young adulthood in a longitudinal design by using (3) a combination of a multi-cohort cross-sequential and an extended twin family design, while (4) capturing a large variation of behavioral and environmental factors in a representative sample of about 4,000 German twin families. In the present article, we first introduce the theoretical and empirical background of the TwinLife study, and second, describe the design, content, and implementation of TwinLife. Since the data will be made available as scientific use file, we also illustrate research possibilities provided by this project to the scientific community