Variable Details

Available Studies

ROS, MAP, MARS, Clinical Core, LATC

Scaled? 

Not Scaled

Variable Type 

Longitudinal

Variable Name 

bisq_loc_dur_max

Categories

Medical Conditions

Longest LOC
BISQ - Longest period of loss of consciousness

Longest period of loss of consciousness (LOC) is based on self-report using the Brain Injury Screening Questionnaire (BISQ). Participants are asked if they have ever lost consciousness in a variety of situations. If answered in the affirmative, participants are then asked to report the longest duration of LOC. This variable is the maximum duration of LOC reported.

Participants are asked the following questions:

Have you ever lost consciousness [in the following situations]? (If yes, what was the longest duration?)

  1. Vehicle accident? (ex: MVA, pedestrian accident, motorcycle/ATV crash)
  2. Hit by an object? (ex: equipment, falling object)
  3. Falling? (ex: down stairs, during a fainting spell, from a high place)
  4. Sports/leisure? (ex: sports, biking, skiing, on the playground)
  5. Physical abuse/assault? (ex: mugged)
  6. Military service? (ex: training, blast injury)
  7. Other? Please specify.

Response choices for duration of LOC:

ValueCoding
1Don't know
2Less than 5 seconds
3Less than 1 minute
41 - 5 minutes
56 - 10 minutes
611 - 20 minutes
721 - 30 minutes
831 - 45 minutes
946 - 60 minutes
101 hour - 23 hours
111 - 2 days
122 days - 1 week
131 week - 1 month
14More than 1 month

Notes: If no instances of LOC are reported (bisq_loc_num = 0), then this variable is set to 0.

Reference: Dams-O'Connor K, Cantor JB, Brown M, Dijkers MP, Spielman LA, Gordon WA. Screening for Traumatic Brain Injury: Findings and Public Health Implications. Journal of Head Trauma Rehabilitation. 2014; 29(6): 479-489. PubMed PMID: 25370440. PMCID: PMC4985006.