This trial is active, not recruiting.

Condition puberty
Sponsor Rigshospitalet, Denmark
Collaborator The Ministry of Science, Technology and Innovation, Denmark
Start date January 2006
End date January 2017
Trial size 2020 participants
Trial identifier NCT01411527, KF01282214


By clinical examinations and withdrawing of blood samples from a large number of healthy Danish children, this study will reveal if age of pubertal onset is declining. Furthermore, the extensive normative data will provide detailed insight into normal ranges and individual changes of anthropometrics and hormone levels in healthy children during childhood and adolescence.

United States No locations recruiting
Other countries No locations recruiting

Study Design

Observational model cohort
Time perspective prospective
Schools were randomly selected and 6203 children (50.0 % girls) were invited to participate. 1864 (1097 girls and 767 boys) (age 5.6-20.0 years) were included, resulting in an overall participation-rate of 30%. Blood samples were drawn, and a thorough clinical examination was performed in all participating children
209 healthy Danish children (108 girls), were examined and blood samples were drawn every 6 months. In july 2011, the mean (range) number of examinations per child was 7 (2-10). 116 (63 boys and 53 girls) continued from the cross sectional study to the longitudinal study. Thus, the total number of participants in The COPENHAGEN Puberty Study was 2020 children.

Primary Outcomes

Pubertal onset
time frame: The pubertal stage and age were recorded in each participating individual in the cross sectional study from January 2006 to January 2009. Probit analysis was used to determine the age of pubertal onset in boys and girls.

Eligibility Criteria

Male or female participants from 5 years up to 20 years old.

Inclusion Criteria: - all children accepting to participate were included Exclusion Criteria: - no children were excluded from examination or blood sampling. In case of chronic diseases, medical treatment, or ethnicity the children may be excluded from specific final data analysis.

Additional Information

Official title The COPENHAGEN Puberty Study
Description The COPENHAGEN Puberty Study is a combined cross sectional and longitudinal study of healthy Danish children. All children will be thoroughly examined and blood- and urine samples will be collected at every visit. The families fill out questionaires. Physical examination: Height; sitting-height; weight; circumference of waist, hip, arm; measurement of fatfolds (biceps, triceps, flank, subscapularis); voice-break (yes/no), blood pressure; pubertal staging according to Tanners classification: breast development (B1-B5), genitalia development boys (G1-G5), pubic hair development (PH1-PH5), axillary hair (yes/no), sweat (yes/no), acne (yes/no Urine sample: For measurement of FSH, LH and endocrine disrupters. Blood sample: For measurement of hormone levels (FSH, LH, estradiol, SHBG, testosterone, DHEAS, androstenedione, inhibin A, inhibin B, Insl3, kisspeptin, ghrelin, leptin, IGF-1, IGFBP3, TSH, T4, Free T4, T3, HbA1C, calcium-ion, PTH, phosphate, 25-OH-vitamine D, AMH), endocrine disrupters (PCB´s, dioxines, parabens, phthalates), isolation of DNA and RNA to evaluate relevant polymorphisms. Questionaire: regarding information of previous growth and health.
Trial information was received from ClinicalTrials.gov and was last updated in December 2013.
Information provided to ClinicalTrials.gov by Rigshospitalet, Denmark.