Print page Print page
Switch language
The Capital Region of Denmark - a part of Copenhagen University Hospital

Long COVID symptoms in SARS-CoV-2-positive adolescents and matched controls (LongCOVIDKidsDK): a national, cross-sectional study

Research output: Contribution to journalJournal articleResearchpeer-review

  1. Identification of genetic loci associated with nocturnal enuresis: a genome-wide association study

    Research output: Contribution to journalJournal articleResearchpeer-review

  2. Are we approaching a better definition of childhood obesity?

    Research output: Contribution to journalComment/debateResearchpeer-review

  1. Association of Common and Rare Genetic Variation in the 3-Hydroxy-3-Methylglutaryl Coenzyme A Reductase Gene and Cataract Risk

    Research output: Contribution to journalJournal articleResearchpeer-review

  2. Use of Inhaled Corticosteroids and Risk of Acquiring Haemophilus influenzae in Patients with Chronic Obstructive Pulmonary Disease

    Research output: Contribution to journalJournal articleResearchpeer-review

  3. Herpes simplex-virusinfektion hos nyfødte

    Research output: Contribution to journalReviewResearchpeer-review

  4. Myokarditis og udvikling af dilateret kardiomyopati

    Research output: Contribution to journalJournal articleResearchpeer-review

View graph of relations

BACKGROUND: Many adolescents have been affected by the COVID-19 pandemic either directly by being infected with the virus or indirectly by lockdowns and restrictions influencing normal living. We aimed to investigate health, including symptoms of long COVID, in adolescents (aged 15-18 years) who tested positive for SARS-CoV-2 compared with a control group.

METHODS: LongCOVIDKidsDK was a national, cross-sectional study carried out in Denmark, which included SARS-CoV-2-positive adolescents and matched controls. All Danish adolescents aged 15-18 years with a positive SARS-CoV-2 test during the period Jan 1, 2020, to July 12, 2021, and a control group matched (1:4) by age and sex were sent a survey from July 20, 2021. Participants had until Sept 15, 2021, to respond. Symptoms associated with COVID-19, school attendance, and health-related quality of life were investigated using ancillary questions and validated questionnaires (Paediatric Quality of Life Inventory [PedsQL] and Children's Somatic Symptoms Inventory-24 [CSSI-24]). Statistical analyses included descriptive statistics and logistic regression. This study is registered at, NCT04786353.

FINDINGS: 24 315 adolescents with a positive SARS-CoV-2 test (case group) and 97 257 matched controls were invited to participate. 3013 matched controls were excluded because of suspected SARS-CoV-2 infection. 6630 (27·3%) responded in the case group and 21 640 (22·3%) responded and were eligible to participate in the control group. Across both groups, median age was 17·6 years (IQR 16·4-18·5), 16 277 (57·6%) of 28 270 responders were female, and 11 993 (42·4%) were male. Participants in the case group had greater odds of having at least one long COVID symptom lasting at least 2 months compared with the control group (3159 [61·9%] vs 12 340 [57·0%], odds ratio 1·22 [95% CI 1·15-1·30]; p<0·0001). Participants in the case group reported significantly lower symptom scores (ie, less somatic distress) on the CSSI-24 than in the control group: mean 10·7 (SD 11·4, median 7·0 [IQR 2·0-15·0]) versus 11·9 (10·6, 9·0 [4·0-17·0]; p<0·0001). Participants in the case group had better quality of life scores on the PedsQL than in the control group: physical functioning mean score 88·7 (SD 13·9, median 93·8 [IQR 84·4-100·0]) versus 86·5 (14·3, 90·6 [81·3-96·9]; p<0·0001); emotional functioning 77·1 (20·3, 80·0 [65·0-95·0]) versus 71·7 (21·4, 75·0 [60·0-90·0]; p<0·0001); social functioning 93·1 (12·5, 100·0 [90·0-100·0]) versus 88·4 (16·2, 95·0 [80·0-100·0]; p<0·0001); and school functioning 66·9 (22·5, 65·0 [60·0-85·0]) versus 62·9 (22·1, 65·0 [50·0-80·0]; p<0·0001). More participants in the case group than in the control group reported 16 or more sick days (1205 [18·2%] vs 2518 [11·6%]; p<0·0001) and 16 or more days of school absence (695 [10·5%] vs 1777 [8·2%]; p<0·0001).

INTERPRETATION: Participants with SARS-CoV-2-positive tests had more long-lasting symptoms and sick leave, whereas participants in the control group had more short-lasting symptoms and worse quality of life. Knowledge of long COVID in adolescents is important to guide clinical recognition and management of this condition.

FUNDING: AP Møller and Chastine McKinney Møller Foundation.

Original languageEnglish
JournalThe Lancet Child & Adolescent Health
Issue number4
Pages (from-to)240-248
Number of pages9
Publication statusPublished - Apr 2022

Bibliographical note

Copyright © 2022 Elsevier Ltd. All rights reserved.

    Research areas

  • Adolescent, COVID-19/complications, COVID-19 Testing, Case-Control Studies, Cross-Sectional Studies, Denmark/epidemiology, Female, Humans, Male, Quality of Life, SARS-CoV-2, Schools, Sick Leave/statistics & numerical data, Surveys and Questionnaires

ID: 78103442