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Table 2 Comparison of the 1996 and 2015 FQ samples

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

Variables 1996 sample (N = 2,323) 2015 sample (N = 2,041) p value
Age (years), mean (SD) 44.9 (16.5) 55.5 (14.1)  < 0.001
Age groups (years), N (%)  < 0.001
 < 29 510 (22) 101 (5)
 30–39 487 (21) 196 (10)
 40–49 446 (19) 392 (19)
 50–59 363 (16) 466 (23)
 ≥ 60 517 (22) 886 (43)
Sex, N (%) 0.02
 Female 1,192 (51) 1,118 (55)
 Male 1,131 (49) 923 (45)
Educational status, N (%)  < 0.001
 Second level, first stage (lower) 621 (27) 281 (14)
 Second level, first stage (medium) 1,036 (45) 831 (41)
 Third level (university) 643 (28) 919 (45)
Married/cohabitant 1,609 (70) 1,549 (76)  < 0.001