ID number
Serum sodium concentration (mmol/liter)
Serum sodium concentration <= 135 mmol/liter
Female
Age (years)
Urine output
Weight (kg) pre-race
Weight (kg) post-race
Weight change (kg) pre/post race
Height (cm)
Body-mass index (kg/m^2)
Race duration (minutes)
Training pace (seconds/mile)
Previous marathons (no.)
Self-reported fluid intake
Self-reported water loading
Self-reported use of NSAIDs