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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