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Table 4 Physical, mental, and total fatigue mean scores (with 95% confidence intervals) in 1996 and 2015 according to sex and 10-year age groups

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

Sex and age groups (N = 1996/2015) Physical 1996 Physical 2015 Mental 1996 Mental 2015 Total 1996 Total 2015
Mean (CI) Mean (CI) Mean (CI) Mean (CI) Mean (CI) Mean (CI)
Males
 18–29 years (N = 233/36) 6.9 (6.6–7.2) 7.3 (6.2–8.5) 4.2 (4.0–4.4) 4.2 (3.6–4.8) 11.1 (10.6–11.6) 11.6 (10.0–13.2)
 30–39 years (N = 245/80) 7.3 (7.0–7.6) 7.7 (6.5–8.1) 4.2 (4.0–4.4) 4.1 (3.8–4.4) 11.5 (11.0–12.0) 10.7 (9.8–11.6)
 40–49 years (N = 216/165) 7.4 (7.0–7.8) 7.1 (6.6–7.6) 4.3 (4.1–4.5) 4.1 (3.9–4.3) 11.7 (11.2–12.2) 11.7 (11.0–12.4)
 50–59 years (N = 180/209) 8.1 (7.6–8.6) 7.7 (7.3–8.1) 4.5 (4.3–4.7) 4.1 (3.9–4.3) 12.6 (12.0–13.2) 11.7 (11.2–12.2)
 ≥ 60 years (N = 238/433) 8.4 (8.0–8.8) 7.8 (7.5–8.1) 4.5 (4.3–4.7)* 4.1 (4.0–4.2) 12.9 (12.4–13.4)* 12.0 (11.7–12.3)
Females
 18–29 years (N = 272/65) 8.0 (7.6–8.4) 8.9 (8.0–9.8) 4.4 (4.2–4.6) 4.3 (3.8–4.8) 12.3 (11.8–12.8) 13.3 (12.1–14.5)
 30–39 years (N = 235/116) 8.2 (7.8–8.6) 8.0 (7.3–8.7) 4.3 (4.1–4.5) 4.3 (4.0–4.6) 12.5 (12.0–13.0) 12.3 (11.3–13.3)
 40–49 years (N = 224/227) 7.9 (7.5–8.3) 8.2 (7.7–8.7) 4.3 (4.1–4.5) 4.3 (4.1–4.5) 12.2 (11.6–12.8) 12.5 (11.8–13.2)
 50–59 years (N = 181/257) 7.8 (7.4–8.2) 8.1 (7.7–8.5) 4.3 (4.1–4.5) 4.3 (4.1–4.5) 12.2 (11.7–12.7) 12.4 (11.9–12.9)
 ≥ 60 years (N = 263/453) 9.0 (8.6–9.4)* 8.0 (7.7–8.3)* 4.4 (4.2–4.6)* 4.0 (3.9–4.1) 13.4 (12.9–13.9)* 12.0 (11.6–12.4)
  1. * Significant differences in mean scores between the 1996 and 2015 samples are set in bold types