{
	"age": {
		"Description": "age of the participant",
		"Units": "years"
	},
	"mmst": {
		"Description": "mini-mental state examination score (only measured for older adults)",
		"Units": "0-30 points"
	},
	"sex": {
		"Description": "sex of the participant",
		"Levels": {
			"m": "male",
			"f": "female"
		}
	}
}