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Table 5 PHQ-9 defined prevalence rates (%) (95%Confidence intervals) of major depressive episodes (MDE) and mean scores (95%confidence intervals) according to sex and age groups

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

Males 18–29 years (N = 36) 30–39 years (N = 81) 40–49 years (N = 167) 50–59 years (N = 216) 60–69 years (N = 256) 70–79 years (N = 187) Total (N = 943)
 MDE cut-off ≥ 10* 11.1 (3.8–25.9) 7.4 (3.2–15.5) 8.3 (5.0–13.7) 6.0 (3.5–10.1) 4.7 (2.6–8.1) 3.7 (1.7–7.7) 5.9 (4.6–7.6)
 MDE algorithm* 2.8 (0.0–15.4) 3.7 (0.8–10.8) 3.6 (1.5–7.8) 2.8 (1.1–6.1) 2.0 (0.7–4.6) 1.6 (0.3–4.8) 2.6 (1.7–3.8)
 PHQ-9 mean score# 3.8 (2.4–5.2) 3.4 (2.4–4.0) 3.2 (2.5–3.9) 2.7 (2.2–3.2) 2.5 (2.1–2.9) 2.4 (1.9–2.7) 2.7 (2.5–2.9)
Females 18–29 years (N = 68) 30–39 years (N = 120) 40–49 years (N = 231) 50–59 years (N = 259) 60–69 years (N = 260) 70–79 years (N = 205) Total (N = 1143)
 MDE cut-off ≥ 10* 17.6 (10.2–28.5)* 10.8 (6.3–17.8) 13.4 (9.6–18.5) 9.3 (6.3–13.5) 7.7 (5.0–11.6) 5.9 (3.3–10.1)* 9.8 (8.2–11.7)
 MDE algorithm* 8.8 (3.8–18.3)* 7.5 (3.8–13.8) 4.3 (2.3–7.9) 2.7 (1.2–5.6) 3.4 (1.7–6.5) 1.0 (0.0–3.7)* 3.8 (2.8–5.0)
 PHQ-9 mean score# 5.2 (4.0–6.4)# 4.1 (3.1–5.1) 3.8 (3.2–4.4) 3.4 (2.9–3.9)# 3.0 (2.5–3.5)# 2.9 (2.4–3.4)# 3.5 (3.3–3.7)#
  1. * Significant age group prevalence differences in bold. #Significant age group mean differences in bold and italics