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Table 2 Descriptive statistics, Cronbach's α, and score distributions for the HADS, by method of administration

From: Measuring health-related quality of life in adolescents and young adults: Swedish normative data for the SF-36 and the HADS, and the influence of age, gender, and method of administration

  Anxiety Depression
  Telephone
(n = 300)
Mail
(n = 280)
Telephone
(n = 300)
Mail
(n = 285)
Mean 4.66 5.31 2.52 2.96
SD 3.35 4.14 2.27 3.14
α .75 .83 .54 .78
Quartile 1 2.00 2.00 1.00 1.00
Median 4.00 5.00 2.00 2.00
Quartile 3 6.00 8.00 3.00 4.00
Range 0–19 0–20 0–14 0–18
% Ceiling 0.0 0.0 0.0 0.0
% Floor 6.0 10.4 14.3 19.3
% Case     
   Mild (8–10) 10.7 16.1 2.3 3.9
   Moderate (11–14) 4.7 9.1 1.7 2.1
   Severe (≥15) 1.7 2.5 0.0 1.4