Chapter 3 100 Table S3.4. Resulting clusters of the IDS-SR with corresponding factor loadings per item, sorted per factor. Items marked as bold are included in the corresponding cluster. Factor/cluster loadings Item statistics IDS item Mood Anxiety Lethargy Somatic communality uniqueness complexity 8 Reactivity of mood/anhedonia 0.89 -0.09 -0.09 0.04 0.688 0.31 1 21 Pleasure or enjoyment (not sex) 0.75 0.05 0.12 0 0.698 0.3 1.1 17 Future pessimism 0.61 0.17 0.05 -0.08 0.508 0.49 1.2 5 Feeling sad 0.49 0.42 0.16 -0.01 0.743 0.26 2.2 19 Lack of interest in people/activities 0.45 0 0.38 -0.03 0.505 0.5 2 7 Feeling anxious or tense 0.02 0.8 0.1 0 0.759 0.24 1 27 Panic/phobic symptoms -0.09 0.7 -0.07 0.22 0.547 0.45 1.2 29 Interpersonal sensitivity 0.08 0.63 0.07 0 0.494 0.51 1.1 16 Self criticism and blame 0.33 0.44 0.13 -0.13 0.504 0.5 2.2 20 Energy/fatiguability 0.06 0.05 0.76 -0.11 0.645 0.36 1.1 30 Leaden paralysis/physical energy -0.01 0.2 0.55 0.13 0.509 0.49 1.4 23 Psychomotor retardation 0.09 0 0.5 0.07 0.318 0.68 1.1 15 Concentration/decision making 0.04 0.24 0.47 0.23 0.555 0.44 2 24 Psychomotor agitation 0 0.12 0.43 0.15 0.31 0.69 1.4 26 Sympathetic arousal -0.19 0.09 0.23 0.61 0.518 0.48 1.6 28 Constipation/diarrhoea 0.17 0.12 -0.27 0.61 0.406 0.59 1.6 10 Quality of mood 0.35 0.31 0.3 -0.04 0.581 0.42 3 11 and 12 Appetite disturbance 0.19 -0.25 0.33 0.32 0.232 0.77 3.5 25 Aches and pains -0.02 0.16 0.16 0.32 0.228 0.77 2 13 and 14 Weight disturbance 0.2 -0.26 0.2 0.26 0.136 0.86 3.8 9 Diurnal variation of mood 0.05 0.18 0.14 0.25 0.196 0.8 2.5 1 Initial insomnia 0.25 -0.09 0.04 0.24 0.114 0.89 2.3 4 Sleeping too much 0.16 0.12 -0.08 0.15 0.066 0.93 3.4 6 Feeling irritable 0.05 0.32 0.36 0.14 0.449 0.55 2.3 18 Suicidal thoughts 0.2 0.32 0.14 0.04 0.288 0.71 2.2 2 Middle insomnia 0.12 0.01 0.14 0.04 0.057 0.94 2.1 3 Early morning awakening 0.2 0.04 0.27 0.02 0.183 0.82 1.9 22 Loss of interest in sex 0.3 -0.09 0 0 0.077 0.92 1.2
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