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Table 1 Differences between participants and non-participants in the study based on register data.

From: Validity of the diagnosis of a single depressive episode in a case register

  Participants in the interview Non-participants in the interview P
Number 399 1087  
Median age at first contact (quartiles) 38.2 (29.5–51.9) 39.6 (29.3–53.1) 0.7*
Gender    
   Men (%) 140 (35.1) 417 (38.4) 0.2**
   Women (%) 259 (64.9) 670 (61.6)  
Type of depression (ICD-10, %)    
   Unspecified 43 (10.8) 128 (11.8)  
   Mild 65 (16.3) 195 (17.9) 0.8**
   Moderate 204 (51.1) 525 (48.3)  
   Severe 87 (21.8) 239 (22.0)  
Type of contact (%)    
   Admission 232 (58.1) 558 (51.3) 0.02**
   Out-patient 167 (41.9) 529 (48.7)  
Duration of contact (quartiles)    
   Admission in days 21.5 (6.0–45.0) 16.0 (4.0–41.0) 0.09*
   Out-patient in days 70.0 (19.0–188.0) 88.0 (29.5–210.5) 0.1*
  1. * Mann-Whitney test (25 – 75 percentiles).
  2. ** χ2 test.