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Table 4 DIF ordinal logistic regression results (Group 2, n = 337)

From: Validity of single item responses to short message service texts to monitor depression: an mHealth sub-study of the UK ACUDep trial

Predictor Odds ratio SE 95 % CI p
Age DIF analysis     
 Age 0.98 0.009 0.96, 1.00 .031
 Age x PHQ-9A 1.00 0.002 1.00, 1.01 .271
 PHQ-9A 1.46 0.044 1.38, 1.55 <.001
Gender DIF analysis     
 Gender (being female) 1.26 0.280 0.81, 1.95 .302
 Gender x PHQ-9A 1.07 0.061 0.95, 1.19 .250
 PHQ-9A 1.39 0.073 1.25, 1.54 <.001
  1. PHQ-9A = Sum of affective PHQ-9 items (Items 1,2,6,7,8,9)