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Table 2 Description of outcome measures assessed by self-report questionnaires*

From: Effects of a cognitive ergonomics workplace intervention (CogErg) on cognitive strain and well-being: a cluster-randomized controlled trial. A study protocol

OutcomeDescription
Primary
 Cognitive Strain PrevalenceAn average of the frequency of cognitive strain over the three subscales (presented below): Disruptions, Interruptions, and Information overload items in the BWP and KWCFS questionnaire modules.
 Disruptions (subscale)Two items from the BWP: working in a noisy environment and working in an environment with distracting objects.
 Interruptions (subscale)One item from the BWP and two items from the KWCFS: i) dealing with interruptions at work, ii) switching from one set of tasks to another before finishing the first, and iii) switching to another task that interrupts the ongoing task.
 Information Overload (subscale)Seven items from the BWP and three items from KWCFS: recalling detailed information, recalling the exact order of work phases, remembering agreed appointments, constantly switching attention from one thing to another, using several different devices, monitoring several things and observing changes, working according to contradictory instructions, having too many messages to handle, not knowing whom instructions concern, and not understanding instructions.
Secondary
 Cognitive StrainAn average of cognitive strain over the three subscales (Disruption, Interruptions, Information overload). First, based on the ten BWP items, the values of the engagement–strain assessments weighted by the frequency value of the item. Second, based on all the 39 BWP items, the values of the engagement–strain assessments weighted by the frequency value of the item.
 Well-beingSeveral independent items or scales. Stress as a single item assessing the experience of stress on a scale of 0 to 10. Recovery as a single item assessing the ability to recover after work on a scale of 0 to 10. General Health as a single item from the COPSOQ-II questionnaire. Burnout with the four-item COPSOQ-II Burn Out index.
 Cognitive Stress SymptomsThe four-item CS scale from the COPSOQ-II questionnaire.
 Work Flow / ProductivitySeveral independent scales. Presenteeism and Subjective Productivity: two items from the Health and Work Performance questionnaire (B14 and B15). Memory Failures: an average of five items from the KWCFS (the frequency of memory failures at work, e.g. inability to remember a password). Attention Failures: an average of five items from the KWCFS (the frequency of attention failures at work, e.g. inability to stay focused on work tasks). Multitasking Failures: an average of three items from the KWCFS (the frequency of the aspects of multitasking failures at work, e.g. trying to do too many tasks at once.)
  1. *Questionnaires are presented in Table 3. KWCFS Knowledge Work Cognitive Failure Scale, BWP Brain Work Profile, COPSOQ-II Copenhagen Psychosocial Questionnaire II