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. Author manuscript; available in PMC: 2008 Jul 10.
Published in final edited form as: Biol Psychiatry. 2005 Feb 15;57(4):319–327. doi: 10.1016/j.biopsych.2004.11.026

Table 3.

Mean (and standard deviation) values for self-report data for participants with positive (n = 39) and negative (n = 22) ΔResponse Bias at Time 1

Δ Response Biasa < 0 Δ Response Bias > 0
Mean SD N Mean SD N t-value p-value
Time 1
 BDI 12.86 8.49 22 9.52 6.76 39 1.69 .096
 BDI anhedonic scoreb 1.95 1.84 22 1.38 1.25 39 1.44 .155
 BDI melancholic scorec 4.09 2.74 22 2.87 1.47 39 2.27 .027
 Social Anhedoniad 6.70 7.04 20 5.78 4.12 37 0.62 .537
 Physical Anhedoniad 12.95 6.98 20 9.59 6.17 37 1.87 .067
Time 2
 BDI 13.17 7.35 9 6.31 4.92 16 2.80 .010
 BDI anhedonic scoreb 2.22 2.11 9 0.75 1.06 16 2.34 .028
 BDI melancholic scorec 4.33 3.57 9 1.88 1.78 16 2.31 .030
 MASQ AD 70.22 12.65 9 52.31 16.15 13 2.78 .012
 ΔResponse Biasa -0.01 0.17 8 0.21 0.24 16 -2.26 .034

Notes: BDI: Beck Depression Inventory-II (Beck et al 1996); MASQ: Mood and Anxiety Symptom Questionnaire (Watson et al 1995), AD: Anhedonic Depression.

a

Difference score between response bias in block 1 and 3 (ΔResponse Bias: block 3 - block 1).

b

Sum of BDI items associated with anhedonic symptoms: loss of pleasure (item #4), loss of interest (item #12), loss of energy (item #15), and loss of interest in sex (item #21).

c

Sum of BDI items associated with melancholic symptoms: loss of pleasure (item #4), guilty feelings (item #5), agitation (item #11), loss of interest (item #12), early morning awakening (item #16b), and loss of interest in sex (item #21).

d

Revised Physical and Social Anhedonia Scales (Chapman and Chapman 1978; Chapman et al 1976; Chapman et al 1980).