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Table 3 Prevalence of chronic fatigue (95% confidence intervals) according to sex and 10-year age group I 1996 and 2015

From: Norwegian reference data on the Fatigue Questionnaire and the Patient Health Questionnaire-9 and their interrelationship

Sex and age groups (N = 1996/2015) Chronic fatigue 1996 Chronic fatigue 2015
% (95%CI) % (95%CI)
Males
 18–29 years (N = 233/36) 5.2 (2.9–8.9) 13.9 (5.6–29.1)
 30–39 years (N = 245/80) 6.9 (4.3–10.9) 10.0 (4.9–18.8)
 40–49 years (N = 216/165) 9.7 (6.4–14.5) 15.2 (10.4–21.5)
 50–59 years (N = 180/209) 12.2 (8.2–17.9) 11.5 (7.8–16.6)
 > 60 years (N = 238/433) 16.8 (12.6–22.1) 12.7 (9.9–16.2)
 Total 10.1 (8.4–12.0) 12.7 (10.7–15.0)
Females
 18–29 years (N = 272/65) 4.8 (2.7–8.1)* 23.1 (14.4–34.8)
 30–39 years (N = 235/116) 11.9 (8.3–16.7) 13.8 (8.6–21.3)
 40—–9 years (N = 224/227) 13.8 (9.9–19.0) 15.0 (10.9–20.2)
 50–59 years (N = 181/257) 10.5 (6.8–15.9) 15.2 (11.3–20.1)
 > 60 years (N = 263/453) 21.7 (17.1–27.1)* 11.3 (8.7–14.5)
 Total 12.6 (10.8–14.6) 13.9 (12.0–16.0)
  1. *Significant differences between the 1996 and 2015 samples are set in bold types